Choose equipment by its job
Start with the function the equipment must perform and where it sits in the train architecture. A controller, driver display, protocol converter and network switch solve different problems.
- Control platform or VCU: executes the assigned vehicle or subsystem logic.
- Remote I/O: connects local sensors and actuators to the control system.
- HMI: presents operating information and available control functions.
- Gateway: maps application data between different communication protocols.
- Ethernet switch or backbone node: provides the required consist or train-wide network connection.
Understand EN 50155 and the project scope
EN 50155 addresses electronic equipment installed on railway vehicles, including operating conditions, design, documentation, testing and integration. Review the applicable edition and the evidence for the exact equipment configuration being offered.
EN 50155 does not establish a Safety Integrity Level (SIL). Functional safety requirements need their own assessment and evidence. EN 50716 addresses software development for onboard railway equipment.
Check the installation environment
Confirm power supply conditions, operating temperature, available space, cooling, connector access and mounting. Shock and vibration evidence must suit the intended installation; IEC 61373 covers testing of equipment used on railway vehicles.
Review electromagnetic compatibility evidence for the selected equipment and connected interfaces. IEC 62236-3-2 addresses emissions and immunity for rolling stock apparatus.
Reference: IEC 61373: rolling stock shock and vibration tests
What to request from the supplier
Compare the proposed hardware and software configuration with your requirements. Resolve interface and documentation gaps before integration starts.
- Datasheet, dimensions, mounting and power requirements.
- Supported interfaces, protocol versions and configuration tools.
- Relevant certificates and reports identifying their scope and equipment version.
- Diagnostic access, firmware update process and replacement procedure.
- Product availability, development status, lifecycle support and acceptance plan.