SIST-TP CLC/TR 50542-1:2025
(Main)Railway applications - Driver's cab train display controller (TDC) - Part 1: General architecture
Railway applications - Driver's cab train display controller (TDC) - Part 1: General architecture
In accordance with the ERTMS/ETCS specifications (mainly Subset 026 and ERA_ERTMS_015560 document), UIC 612 leaflet, EN 50126 (series), EN 16186 (series) and EN 61375 (series) requirements, this Technical Report describes the Train Display System (TDS) in the driver’s cab which comprises the Train Display Controller (TDC) and the following six interfaces:
- Interface with Command Control Display (CCD),
- Interface with Train Radio Display (TRD),
- Interface with Electronic Timetable Display (ETD),
- Interface with Technical and Diagnostic Display (TDD),
- Interface with ETCS Onboard systems and the interfaced STMs, which is excluded from the scope of this document,
- Interface with Other Onboard Systems.
[Figure 1]
NOTE Dotted lines are not described by this document.
The scope of this document is to define the functional architecture around the (TDC).
This document excludes the following items:
- Communication protocols (e.g. EN 61375 series);
- Ergonomic aspects;
- Interface with ETCS Onboard systems and the interfaced STMs;
- Train functions;
- GSM-R EIRENE functions;
- Use of the displays as terminals for maintenance purpose.
Bahnanwendungen - Display-Steuereinheit für Führerräume - Teil 1: Allgemeine Architektur
Applications ferroviaires - Contrôleur d'écrans de cabine (TDC) - Partie 1 : Architecture générale
Železniške naprave - Krmilnik vlakovnega prikazovalnika v strojevodjevem prostoru - 1. del: Splošna arhitektura
General Information
Relations
Standards Content (Sample)
SLOVENSKI STANDARD
01-julij-2025
Nadomešča:
SIST-TP CLC/TR 50542-1:2019
Železniške naprave - Krmilnik vlakovnega prikazovalnika v strojevodjevem
prostoru - 1. del: Splošna arhitektura
Railway applications - Driver's cab train display controller (TDC) - Part 1: General
architecture
Bahnanwendungen - Display-Steuereinheit für Führerräume - Teil 1: Allgemeine
Architektur
Applications ferroviaires - Contrôleur d'écrans de cabine (TDC) - Partie 1 : Architecture
générale
Ta slovenski standard je istoveten z: CLC/TR 50542-1:2025
ICS:
35.240.60 Uporabniške rešitve IT v IT applications in transport
prometu
45.020 Železniška tehnika na Railway engineering in
splošno general
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
TECHNICAL REPORT CLC/TR 50542-1
RAPPORT TECHNIQUE
TECHNISCHER REPORT April 2025
ICS 35.240.60; 45.020 Supersedes CLC/TR 50542-1:2018
English Version
Railway applications - Driver's cab train display controller (TDC)
- Part 1: General architecture
Applications ferroviaires - Contrôleur d'écrans de cabine Bahnanwendungen - Display-Steuereinheit für Führerräume
(TDC) - Partie 1 : Architecture générale - Teil 1: Allgemeine Architektur
This Technical Report was approved by CENELEC on 2025-04-16.
CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus, the Czech Republic,
Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the
Netherlands, Norway, Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,
Türkiye and the United Kingdom.
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2025 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
Ref. No. CLC/TR 50542-1:2025 E
Contents Page
European foreword . 3
Introduction . 4
1 Scope . 5
2 Normative references . 6
3 Terms and definitions . 6
4 Symbols and abbreviated terms . 8
5 Functions . 9
5.1 Definitions . 9
5.2 Delays . 11
6 Communication . 11
7 Safety targets . 11
8 Certification/validation . 11
9 TDC general description . 12
9.1 General . 12
9.2 Information destination . 12
9.3 Second source . 12
9.4 TDC and display maintenance and LCC . 13
9.5 Safety and reliability targets . 13
9.6 TDC display redundancy management . 13
9.7 Examples of a TDC architecture . 14
Annex A (informative) Relations between the functions described in the documents of the CLC/TR
50542 series . 17
Bibliography . 19
European foreword
This document (CLC/TR 50542-1:2025) has been prepared by CLC/TC 9X “Electrical and electronic
applications for railways”.
This document supersedes CLC/TR 50542-1:2018 and all of its amendments and corrigenda (if any).
CLC/TR 50542-1:2018:
• No technical changes.
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent
rights. CENELEC shall not be held responsible for identifying any or all such patent rights.
Any feedback and questions on this document should be directed to the users’ national committee. A complete
listing of these bodies can be found on the CENELEC website.
Introduction
This document is the first one of a series of three documents:
— CLC/TR 50542-1, Railway applications — Driver's cab Train Display Controller (TDC) — Part 1: General
architecture (this document);
— CLC/TR 50542-2, Railway applications — Driver's cab Train Display Controller (TDC) — Part 2: Display
systems FIS;
— CLC/TR 50542-3, Railway applications — Driver's cab Train Display Controller (TDC) — Part 3: Other train
systems FIS.
These documents are not standards but studies on the future view of the system. They do not describe an
existing solution for the Train Display System (TDS).
The purpose of this series of documents is to propose harmonization for communication between the displays
on the driver's desk and the train onboard systems.
The need for this harmonization has grown out of several trends.
One trend is that the rolling stock is being computerized more and more, enabling sophisticated functions within
various train onboard systems.
Furthermore, the driver’s desk of such rolling stock is built around one or several computerized displays. These
allow the driver to interact with rolling stock functions and train onboard systems. The user interfaces are
typically user friendly, featuring e.g. graphics and colours.
In case of degraded situation (display failure) and with several displays available on the desk, relocation of
important information to a display that is still working will improve operational availability.
A second trend is the ongoing harmonization of the interfaces on the train.
A third trend is that a European market is opened for onboard equipment.
Traditionally, some onboard systems are linked to a country and/or to a rolling stock type. This has effectively
limited the rolling stock to operate within a limited number of countries. The two trends above are useful to
reduce this limitation.
The combination of the above trends leads to the conclusion that during train operation, train onboard systems
need to have access to the displays on the desk. Furthermore, it is desirable to maintain the advantages of
multi-display installations, allowing the ability to switch to another display in case of a display failure. Thus a
certain level of integration and harmonized communication is helpful.
Another motivation for this series of documents is related to the Life-Cycle Cost and supports the easier
replacement of displays and desk equipment during the lifetime of the vehicle, independently of the supplier.
In this series of documents, the Other Train Systems (OTS), the displays and the Train Display Controller (TDC)
are considered only regarding their functionalities and not as physical devices.
1 Scope
In accordance with the ERTMS/ETCS specifications (mainly Subset 026 and ERA_ERTMS_015560 document),
UIC 612 leaflet, EN 50126 series, EN 16186 series and EN 61375 series requirements, this document describes
the Train Display System (TDS) in the driver’s cab which comprises the Train Display Controller (TDC) and the
following six interfaces:
— Interface with Command Control Display (CCD);
— Interface with Train Radio Display (TRD);
— Interface with Electronic Timetable Display (ETD);
— Interface with Technical and Diagnostic Display (TDD);
— Interface with ETCS Onboard systems and the interfaced STMs, which is excluded from the scope of this
document;
— Interface with Other Onboard Systems.
Key
1 TDC 6 TDD
2 TDS 7 ETCS / STM Onboard systems
3 CCD 8 Other Onboard Systems
4 TRD 9 Driver
5 ETD
Figure 1 — Functional architecture
NOTE Dotted lines are not described by this document.
The scope of this document is to define the functional architecture around the TDC.
This document excludes the following items:
— communication protocols (e.g. EN 61375 series);
— ergonomic aspects;
— interface with ETCS Onboard systems and the interfaced STMs;
— train functions;
— GSM-R EIRENE functions;
— use of the displays as terminals for maintenance purpose.
2 Normative references
There are no normative references in this document.
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
ISO and IEC maintain terminology databases for use in standardization at the following addresses:
• ISO Online browsing platform: available at https://www.iso.org/obp
• IEC Electropedia: available at https://www.electropedia.org/
3.1
driver machine interface
device used for bidirectional exchange of information with the driver
Note 1 to entry: Information is carried through this interface in visual, acoustic and tactile (driver’s pressing of buttons)
form.
Note 2 to entry: It contains the hardware and software means to support or inform the driver.
3.2
button event
pressing or releasing a button
3.3
button
operating element for interaction with the cab display (hard key, soft key, sensitive area)
[SOURCE: EN 16186-3: 2022, 3.5]
3.4
cab display
hardware device or system that shows text and/or graphic information to the user
3.5
hard key
physical key with permanent marking outside the screen area
Note 1 to entry: This permanent marking can be alpha and/or numeric and/or a symbol.
[SOURCE: EN 16186-3: 2022, 3.18]
3.6
indicator
element designed to draw attention to train onboard system status which requires a response
3.7
sensitive area
enabled area on a touchscreen on which a physical action is possible in order to give input to the display
3.8
soft key
context-dependent key consisting of a combination of a hard key and an associated screen label (text or symbol)
Note 1 to entry: This key is for multifunctional use.
[SOURCE: EN 16186-3:2022, 3.29]
3.9
label
symbol or text indication on or close to an indicator or a button
[SOURCE: EN 16186-32022, 3.20, modified – The example has been removed]
3.10
train display controller
TDC
equipment used to manage information between displays on the driver's desk and the train
Note 1 to entry: TDC is called DCU (Display Control Unit) in UIC 612 leaflet series. See Bibliography.
3.11
train display system
TDS
TDC and the displays
Note 1 to entry: The dotted line in Figure 1 represents the boundary between driver and ETCS/OTS.
3.12
display
hardware device or system that shows text and/or graphic information to the user combined
with input device
Note 1 to entry: The sounds can be played by a separate sound generator.
Note 2 to entry: It can include the sound interface.
[SOURCE: EN 16186-3:2022, 3.8; modified - “combined with input device” has been added at the end of the
definition, note 1 to entry has been modified, note 2 to entry has been added]
3.13
other train systems
train onboard systems interfaced with the TDC excluding ETCS/STM onboard, class B ATP systems, and the
displays
EXAMPLE Trainborne systems could be the train systems interacting with the driver through the TDC (e.g. brake
system, HVAC systems, traction system, CCTV).
Note 1 to entry: The interface between the TDC and the ETCS/STM onboard is described in Subset 121 (see
Bibliography).
Note 2 to entry: The interface between the TDC and the displays is described in CLC/TR 50542-2.
Note 3 to entry: To reach the goal of TDC interchangeability including some already existing class B ATP systems not
using the STM interface as specified in the CCS TSI, a standardization of the interfaces of these class B ATP systems is
expected.
[SOURCE: CLC/TR 50542-3:2016, 3.1, modified – The Note 3 to entry has been added]
4 Symbols and abbreviated t
...
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