: Sensors (current, voltage, speed) and firing unit printed board assemblies.
The IEC 60571 standard is the international benchmark for electronic equipment used on rolling stock . Published by the International Electrotechnical Commission , it provides the essential framework for the design, construction, and testing of electronics—from control units to power supplies—ensuring they survive the extreme conditions of railway environments. Scope and Application iec 60571 standard pdf
Resistance to constant shock and vibration, often tested in conjunction with Electrical : Sensors (current, voltage, speed) and firing unit
While I couldn't find a freely available, complete PDF of the IEC 60571 standard, you may find some helpful resources: : Sensors (current