The Railway Standards
Questions about railway suitability refer to compliance with DIN EN 50155. Although EN 50155 does have an international counterpart (IEC 60751), EN 50155 is the current railway standard recognized around the world.
This standard describes railway applications and is applied to electronic equipment used on rolling stock. The standard does not involve a certificate or compel compliance; rather, this standardization classifies operating conditions in railway vehicles so they are consistently comprehensible and comparable.