EN50155 is a European standard that defines the specific requirements for electronic equipment used on rolling stock in railway applications. It is titled “Railway Applications – Electronic Equipment used on Rolling Stock” and is published by the European Committee for Electrotechnical Standardization (CENELEC).

The standard EN50155 sets out the criteria for electronic devices, systems, and components that are installed on trains, trams, and other railway vehicles. It covers various aspects related to the performance, reliability, and safety of electronic equipment in the challenging environment of railway applications.

Some key areas addressed by EN50155 include:

• Environmental Conditions: The standard defines requirements for temperature, humidity, vibration, shock, and other environmental factors that electronic equipment on rolling stock must withstand.
• Electrical and Electromagnetic Compatibility (EMC): EN 50155 specifies criteria for electrical safety and EMC to ensure that equipment operates reliably without causing interference to other systems or being affected by external electromagnetic fields.
• Power Supply: The standard defines requirements for power supply systems, including voltage ranges, voltage interruptions, voltage dips, and insulation coordination.
• Mechanical Design: EN50155 covers aspects related to mechanical design, such as mounting, protection against dust and moisture, and resistance to mechanical stress and vibration.
• Reliability and Availability: The standard sets out criteria for the reliability and availability of electronic equipment, including mean time between failures (MTBF), mean time to repair (MTTR), and redundancy considerations.