Railway applications - Track - Track geometry quality - Part 2: Measuring systems - Track recording vehicles

This European Standard specifies the minimum requirements for track geometry measuring principles and systems in order to produce comparable results when measuring the same track. It applies to all measuring systems, attended or unattended, fitted on any vehicle, except track construction and maintenance machines. Only systems put into service after the standard comes into force are concerned.
This standard does not define the requirements for vehicle acceptance.
This standard does not apply to measuring systems dedicated to urban rail such as tramways, light rail or similar networks.

Bahnanwendungen - Oberbau - Geometrische Gleislagegüte - Teil 2: Messsysteme - Gleismessfahrzeuge

Dieses Dokument beschreibt die minimalen Anforderungen an Messprinzipien und Systeme für die Gleisgeometrie, um vergleichbare Ergebnisse bei Messung desselben Gleises zu erzielen. Das Dokument betrifft alle Messsysteme mit oder ohne Bediener, die an Fahrzeugen angebracht sind, mit Ausnahme der in EN 13848 3 und EN 13848 4 festgelegten Systeme. Nur nach dem Inkrafttreten der Norm in Betrieb genommene Geräte sind hiervon betroffen.
Diese Europäische Norm definiert nicht die Abnahmebedingungen für Fahrzeuge.
Dieses Dokument gilt nicht für Messeinrichtungen für städtische Schienenbahnen.

Applications ferroviaires - Voie - Qualité géométrique de la voie - Partie 2 : Systèmes de mesure - Véhicules d'enregistrement de la voie

Le présent document spécifie les exigences minimales pour les principes de mesure de la géométrie de la voie et pour les systèmes de mesure de la géométrie de la voie dans le but de produire des résultats comparables lors de mesures sur une même voie. Il s'applique à l'ensemble des systèmes de mesure (surveillés ou non) équipant les véhicules, à l'exception des systèmes définis dans les normes EN 13848 3 et EN 13848 4. Seuls les systèmes mis en service après la mise en application de la norme sont concernés.
Le présent document n'entend pas non plus définir les exigences relatives à l'acceptation du véhicule.
Le présent document ne s'applique pas aux systèmes de mesure dédiés aux systèmes ferroviaires urbains.

Železniške naprave - Zgornji ustroj proge - Kakovost tirne geometrije - 2. del: Merilni sistemi - Merilna vozila

General Information

Status
Published
Public Enquiry End Date
31-Dec-2018
Publication Date
26-Nov-2020
Technical Committee
Current Stage
6060 - National Implementation/Publication (Adopted Project)
Start Date
26-Nov-2020
Due Date
31-Jan-2021
Completion Date
27-Nov-2020

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SLOVENSKI STANDARD
SIST EN 13848-2:2021
01-januar-2021
Nadomešča:
SIST EN 13848-2:2006
Železniške naprave - Zgornji ustroj proge - Kakovost tirne geometrije - 2. del:
Merilni sistemi - Merilna vozila

Railway applications - Track - Track geometry quality - Part 2: Measuring systems -

Track recording vehicles
Bahnanwendungen - Oberbau - Geometrische Gleislagegüte - Teil 2: Messsysteme -
Gleismessfahrzeuge

Applications ferroviaires - Voie - Qualité géométrique de la voie - Partie 2 : Systèmes de

mesure - Véhicules d'enregistrement de la voie
Ta slovenski standard je istoveten z: EN 13848-2:2020
ICS:
45.080 Tračnice in železniški deli Rails and railway
components
93.100 Gradnja železnic Construction of railways
SIST EN 13848-2:2021 en,fr,de

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN 13848-2:2021
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SIST EN 13848-2:2021
EN 13848-2
EUROPEAN STANDARD
NORME EUROPÉENNE
November 2020
EUROPÄISCHE NORM
ICS 93.100 Supersedes EN 13848-2:2006
English Version
Railway applications - Track - Track geometry quality -
Part 2: Measuring systems - Track recording vehicles

Applications ferroviaires - Voie - Qualité géométrique Bahnanwendungen - Oberbau - Geometrische

de la voie - Partie 2 : Systèmes de mesure - Véhicules Gleislagegüte - Teil 2: Messsysteme -

d'enregistrement de la voie Gleismessfahrzeuge
This European Standard was approved by CEN on 5 July 2020.

CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this

European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references

concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN

member.

This European Standard exists in three official versions (English, French, German). A version in any other language made by

translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management

Centre has the same status as the official versions.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,

Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,

Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and

United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels

© 2020 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 13848-2:2020 E

worldwide for CEN national Members.
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SIST EN 13848-2:2021
EN 13848-2:2020 (E)
Contents Page

European foreword ....................................................................................................................................................... 4

1 Scope .................................................................................................................................................................... 5

2 Normative references .................................................................................................................................... 5

3 Terms and definitions ................................................................................................................................... 5

4 Symbols and abbreviations ......................................................................................................................... 8

5 Track geometry recording system ............................................................................................................ 8

5.1 General description ........................................................................................................................................ 8

5.2 Environmental conditions ........................................................................................................................... 9

5.3 Track features input ................................................................................................................................... 10

5.4 Localization device ...................................................................................................................................... 11

5.5 Measuring devices ....................................................................................................................................... 11

5.6 Resolution ....................................................................................................................................................... 12

5.7 Signal processing .......................................................................................................................................... 12

5.8 Data processing and analysis ................................................................................................................... 12

5.9 Data presentation and storage ................................................................................................................ 13

6 Testing of track geometry recording system ..................................................................................... 14

6.1 Introduction ................................................................................................................................................... 14

6.2 Calibration ...................................................................................................................................................... 14

6.3 Validation ........................................................................................................................................................ 14

Annex A (informative) Frequency analysis ...................................................................................................... 26

A.1 General description ..................................................................................................................................... 26

A.2 Practical calculation .................................................................................................................................... 27

A.3 Applications within this standard .......................................................................................................... 28

Annex B (informative) Principles of measurement ...................................................................................... 31

B.1 General description ..................................................................................................................................... 31

B.2 Longitudinal level and alignment .......................................................................................................... 31

B.3 Track gauge .................................................................................................................................................... 31

B.4 Cant .................................................................................................................................................................... 32

B.5 Twist ................................................................................................................................................................. 32

Annex C (normative) Description of field tests: values to be respected ................................................ 33

C.1 General ............................................................................................................................................................. 33

C.2 Repeatability .................................................................................................................................................. 33

C.3 Reproducibility ............................................................................................................................................. 35

C.4 Cross check ..................................................................................................................................................... 36

Annex D (informative) Track geometry measurement uncertainty ....................................................... 38

D.1 General ............................................................................................................................................................. 38

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EN 13848-2:2020 (E)

D.2 Evaluating uncertainty for track geometry measurement systems ........................................... 39

D.3 Measurement uncertainty: limit values ............................................................................................... 41

Annex E (informative) Cross checks in the space domain .......................................................................... 43

Bibliography ................................................................................................................................................................. 44

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SIST EN 13848-2:2021
EN 13848-2:2020 (E)
European foreword

This document (EN 13848-2:2020) has been prepared by Technical Committee CEN/TC 256 “Railway

applications”, the secretariat of which is held by DIN.

This European Standard shall be given the status of a national standard, either by publication of an

identical text or by endorsement, at the latest by May 2021, and conflicting national standards shall be

withdrawn at the latest by May 2021.

Attention is drawn to the possibility that some of the elements of this document may be the subject of

patent rights. CEN shall not be held responsible for identifying any or all such patent rights.

This document supersedes EN 13848-2:2006.

This European Standard is one of the series EN 13848 “Railway applications — Track — Track geometry

quality” as listed below:
— Part 1: Characterization of track geometry;
— Part 2: Measuring systems — Track recording vehicles;
— Part 3: Measuring systems — Track construction and maintenance machines;
— Part 4: Measuring systems — Manual and lightweight devices;
— Part 5: Geometric quality levels — Plain line, switches and crossings;
— Part 6: Characterization of track geometry quality.

According to the CEN-CENELEC Internal Regulations, the national standards organisations of the

following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria,

Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland,

Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Republic of

North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the

United Kingdom.
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SIST EN 13848-2:2021
EN 13848-2:2020 (E)
1 Scope

This document specifies the minimum requirements for track geometry measuring principles and track

geometry measuring systems in order to produce comparable results when measuring the same track.

It applies to all measuring systems, attended or unattended, fitted on any vehicle, except those systems

defined in EN 13848-3 and EN 13848-4. Only systems put into service after the standard comes into

force are concerned.
This document does not define the requirements for vehicle acceptance.

This document does not apply to measuring systems dedicated to Urban Rail Systems.

2 Normative references

The following documents are referred to in the text in such a way that some or all of their content

constitutes requirements of this document. For dated references, only the edition cited applies. For

undated references, the latest edition of the referenced document (including any amendments) applies.

EN 13848-1, Railway applications - Track - Track geometry quality - Part 1: Characterization of track

geometry

EN 13848-6, Railway applications - Track - Track geometry quality - Part 6: Characterisation of track

geometry quality

JCGM 200:2012, International vocabulary of metrology – Basic and general concepts and associated terms

(VIM)
3 Terms and definitions
For the purpose of this document, the following terms and definitions apply.

ISO and IEC maintain terminological databases for use in standardization at the following addresses:

— IEC Electropedia: available at http://www.electropedia.org/
— ISO Online browsing platform: available at https://www.iso.org/obp
3.1
track geometry recording vehicle

self-propelled or hauled vehicle with fixed, dedicated, measuring equipment and systems, used for the

measurement, assessment and recording of track geometry parameters under loaded conditions, which

measures and produces consistent results to the requirements of EN 13848-1

Note 1 to entry: The measuring system can be attended or not. The track geometry recording vehicle belongs to

the infrastructure inspection vehicles as defined in TSI Loc&Pas 1302/2014/EU.
3.2
sensor

device which detects, measures and translates characteristics of track geometry into quantities that can

be used for further data processing
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EN 13848-2:2020 (E)
3.3
repeatability

degree of agreement between the values of successive measurements of the same parameter made

under the same conditions, within a short period of time, where the individual measurements are

carried out on the same section of track using the same measurement and interpretation methods,

subject to the following controls:
— similar speed;
— same measuring direction;
— same vehicle orientation;
— similar environmental conditions
3.4
reproducibility

degree of agreement between the values of successive measurements of the same parameter made

under varying conditions, within a short period of time, where the individual measurements are carried

out on the same section of track using the same measurement and interpretation methods, subject to

one or more of the following:
— variation of speed;
— different measuring directions;
— different vehicle orientations;
— different environmental conditions
3.5
comparability

degree of agreement of different track recording vehicles achieved under the same conditions

3.6
validation

set of tests for determining if a track recording vehicle complies with the requirements of this standard

3.7
calibration

set of procedures for adjusting the measuring devices of track measuring systems in order to meet the

requirements of this standard as defined in JCGM 200:2012
3.8
event

record of a track or line-side feature that can be either technical, physical or natural

3.9
localization
information required to locate events and the measured track geometry
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SIST EN 13848-2:2021
EN 13848-2:2020 (E)
3.10
reference track

track with known characteristics to allow adequate testing of the track geometry measuring and

recording system
3.11
unattended geometry measuring system (UGMS)

track geometry measuring system fitted on a vehicle, without any human interaction during the

measurements
3.12
adjustment of a measuring system

set of operations carried out on a measuring system so that it provides prescribed indications

corresponding to given values of a quantity to be measured
[SOURCE: VIM - International vocabulary of metrology JCGM 200:2012]
3.13
cross check

method for comparing signals of a single run for linked parameters obtained from different inputs (e.g.

devices or signal processing)
3.14
vehicle orientation

physical positioning of a vehicle, with regards to which end of the vehicle is leading during

measurement

Note 1 to entry: There are two possible vehicle orientations as shown in Figure 1.

Figure 1 — Possible vehicle orientations
3.15
measuring direction

course between two points on a track, independent of the orientation of the track recording vehicle

Note 1 to entry: Between two given points A and B, there are two opposite directions: A to B and B to A.

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4 Symbols and abbreviations
For the purpose of this document, the following symbols and abbreviations apply.
Table 1 — Symbols and abbreviations
Symbol Designation Unit
D1 Wavelength range 3 m < λ ≤ 25 m m
D2 Wavelength range 25 m < λ ≤ 70 m m
Wavelength range 70 m < λ ≤ 150 m for longitudinal level
D3 m
Wavelength range 70 m < λ ≤ 200 m for alignment
λ Wavelength m
Vmax Maximum possible measuring speed of a recording system km/h
Vmin Minimum possible measuring speed of a recording system km/h
5 Track geometry recording system
5.1 General description

For the purpose of this document, the track geometry recording system is divided into several units as

represented in Figure 2 below:
Figure 2 — Track geometry recording system
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EN 13848-2:2020 (E)

When measuring the same track, track geometry recording systems shall produce results that are

consistent and comparable, irrespective of the measuring speed and direction of travel. The measuring

results can be used for track quality monitoring, maintenance planning and can contribute to the

process of safety assurance as related to track geometry.

The track geometry recording system represents the totality of the equipment required to:

— measure track geometry parameters;

— take measurement or information to allow the position to be determined during measuring

operations;

— associate these two measurements in order to locate precisely on the track the values exceeding a

prescribed threshold or other elements characterizing the track;
— record these parameters on computer readable media;

— calculate, based on the direct measured parameters, other parameters of the track geometry (e.g.

twist, curvature);
— process the measured data, in order to analyse the track geometry parameters;
— present and store the results.

The output of the track geometry recording system shall meet the individual parameter requirements of

EN 13848-1. All the data necessary to determine the parameters specified in EN 13848-1 shall be taken

and stored during the run. The determined parameters should be graphically displayed and analysed in

strict relation to the corresponding distance location.

The track geometry recording system shall be monitored and shall allow measurements of track

geometry as specified in EN 13848-1 under loaded conditions of the track.

The computer system shall be of a kind and type suitable for railway vehicle bound applications.

To prevent the interruption of the track geometry measurement and the loss of recorded data in case

the measuring hardware power supply fails, an adequate uninterruptible power supply should be

provided.
5.2 Environmental conditions
5.2.1 Introduction

All the measuring devices and hardware components fitted on a track-recording vehicle shall produce

reliable results under the environmental conditions specified below.
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5.2.2 Climatic conditions

The effects of climatic conditions on components outside and inside the track-recording vehicle shall be

considered. These shall include:
— Outside components
— ambient temperature;

— condensation, particularly with sudden variation of temperature at the entrance or at the exit

of a tunnel;

— possibility of extreme weather conditions (heavy rain, snow, direct sunlight, …);

— ambient relative humidity.
— Inside components
— ambient temperature for operating and storage conditions;
— ambient relative humidity.
5.2.3 Operating conditions
The effects of operating conditions shall be considered. These shall include:
— ballast or iron fragments impacts;
— grease on the rail;
— reflection condition of the rail;
— characteristic light conditions;
— dust, water and snow in connection with aerodynamic conditions;
— safety requirements e.g. laser beam;
— vibrations and shocks;
— electromagnetic environment;
— compatibility with signalling and communication systems.
5.3 Track features input

The track features input supports the data analysis (see 5.8) and shall include at least:

— set of limit values of track geometry parameters as defined in EN 13848-5;
— line speed.
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EN 13848-2:2020 (E)
Other inputs can be beneficial as, for example:
— geo-spatial positioning;
— line side features such as switches, level crossings, bridges, tunnels;
— track components and track alignment design parameters.
All this data should be able to be entered by manual or automatic means.
5.4 Localization device

The reference point for the data localization system may be the kilometre post or other fixed points.

The localization device gives the track recording vehicle’s position along the track and shall fulfil the

following functions:

— synchronizes the position with the reference point by one of the various possible methods, using

for example the satellite based positioning system, active or passive beacons, track layout or other

singular points;

— measures the distance covered by the track recording vehicle, compensated for direction “reverse”,

and is generally based on a synchronization signal, which could be given by a wheel-mounted

encoder or any other equivalent method;
— corrects manually or automatically the inaccuracies caused by:
— wear, sliding, conicity of the track recording vehicle wheels;

— non-homogeneous reference post distances (e.g. mileposts that are greater or less than one

mile apart);
— uncertainty of the distance run transducer.
5.5 Measuring devices
5.5.1 General

Track geometry measuring system relies on sensors, signal transmission and signal processing

following various measuring principles as described in Annex B.

The speed range shall be from standstill to the maximum permissible measuring speed of the vehicle if a

chord-type measuring system is used; if an inertial-type measurement is used, a minimum speed may

be necessary to measure some parameters. The minimum speed should be specified according to the

characteristics of the used system and the needs defined by the infrastructure manager (e.g. for

conventional inertial-type measurement systems usually 10 km/h is necessary for the wavelength

range D1).
5.5.2 Sensors

The sensors shall measure in real time the track geometry parameters or their components. In order to

measure the parameters under track loaded conditions, the sensors placed under the vehicle’s frame

shall be as close as possible to one of the vehicle’s loaded axles to respect measurement conditions

indicated in EN 13848-1. The sensors can be either contact type or non-contact type sensors.

The sensors’ mechanical and electrical characteristics (frequency response, signal-to-noise ratio, gain,

etc.) shall be adequate to enable the generation of track geometry parameters, independently of the

environmental conditions on the railway network.
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5.5.3 Signal transmission

Signal transmission consists of all components which are necessary for data interchange between the

sensors and the signal processing unit.
It shall at least comply with the following requirements:
— no phase shift;
— no distortion of results data;
— compliance with appropriate industry-accepted data interchange standards.

The transmission characteristics shall be appropriate to the maximum measuring speed of the track

recording vehicle and the data volume.
5.6 Resolution

The resolution shall be ≤ 0,1 mm for every measured principal track geometric parameter, as defined in

EN 13848-1.
5.7 Signal processing

Signal processing provides the data for some of the track geometry parameters compliant with

EN 13848-1 using signals coming from several sensors. The remaining parameters are calculated from

the output of the signal processing e.g. twist.
The signal processing shall respect the following points:

— sampling: all measurements shall be sampled at equally spaced intervals of preferably 0,25 m or

less but not larger than 0,5 m;

— decolouring: in case of chord measurements the signal shall be decoloured according to

EN 13848-1;

— filtering: the filter characteristics for the wavelength ranges shall be compliant with EN 13848-1

and shall be described. To prevent aliasing of the data the analogue signal shall be filtered in

accordance with the sampling theorem.
5.8 Data processing and analysis
5.8.1 General requirements

The software shall be flexible and modular in order to facilitate modifications, for example filter

implementations or output formats.

An increase in the number of input signals as well as of the number of calculations made shall be

foreseen in the system design.
5.8.2 Parameter generation

The output of signal processing in 5.7 is used to generate all the track parameters as defined in

EN 13848-1.
5.8.3 Data merging

In order to assess the track geometry quality, the track parameters shall be synchronized with track

localization and track features.
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EN 13848-2:2020 (E)
5.8.4 Parameter analysis

The track geometry parameters defined in EN 13848-1 are analysed for the quality levels and safety

related limits defined in EN 13848-5.
5.8.5 Preparation for output interfaces

The data processing system shall condition signals and associated information for different outputs:

— data storage;
— parameters visualization;
— track geometry chart;
— threshold exceeding values;
— standard deviation and mean values;
— calibration;
— online plausibility check.
5.9 Data presentation and storage
5.9.1 Operator-interfaces

In order to allow the operator to monitor the track geometry recording system an interface shall be

provided with the following characteristics:

— access to the system configuration parameters e.g. filter coefficients, calibration settings;

— access to all diagnostic information of the measuring system (e.g. laser temperature, raw data,

sensor voltage) in order to detect and analyse malfunctions.
5.9.2 End user-interfaces

Because the end users of the measured data, e.g. permanent way engineers, are basically interested in

the track geometry condition, the end user interface shall at least comprise a graphical and/or text

representation of:
— track geometry parameters;
— threshold values;
— localization data;
— track features.
5.9.3 Output of analysis results

Outputs shall be provided in accordance with requirements stated in EN 13848-1 and 5.8.5 above.

5.9.4 Data transmission

The data shall be transferable using removable storage media, a network or radio link complying with

an industry standard.
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5.9.5 Data storage

As a minimum, the following data shall be stored in a prescribed retrievable format:

— measured parameters as described in EN 13848-1;

— results of the parameters analysis described above, including settings, if processing is done on

board;
— localization information linked to measured parameters;
— date and time of the measuring run;
— identification of the measuring vehicle;
— user remarks and actions;
— information of measurement validity.
6 Testing of track geometry recording system
6.1 Introduction

This clause covers actions and procedures, which are necessary to ensure effective operation of both

the measuring devices and the corresponding processing system:
a) Calibration

This ensures an accurate setting of the devices within the track geometry recording system.

b) Validation and adjustment

This demonstrates that the whole system complies with the requirements needed to operate correctly.

Also, this ensures that the system continues to operate correctly during routine operations.

6.2 Calibration

The measuring device shall be calibrated to ensure the continued accuracy of measurements. The

calibration is performed according to a specified process. It shall be carried out by appointment by the

manufacturer or the user.

NOTE Usually the calibration is made before the delivery of the measuring system.

6.3 Validation
6.3.1 Overview

After the calibration of the track geometry recording system, a method based on comparison between

different measurement runs on the same section of track shall be used to validate the recording system.

Validation procedures shall be applied to the following:
— initial testing of a new or modified track geometry recording system;

— after a maintenance or repair operation on the track geometry recording system;

— on regular basis.
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Additionally, simplified validation can be applied during normal operation.
There are three kinds of validation:
— static tests (see 6.3.2);
— dynamic tests (see 6.3.3);
— in operation (see 6.3.5).
6.3.2 Static tests
Static tests concern mainly track gauge and cross level measurements
...

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