The driver’s cab is the most demanding installation area in a vehicle in terms of ergonomics and the reliability of manually operated components. Equipment operates under continuous vibration and shock transmitted from the bogies, across a wide temperature range and under changing illumination - from night conditions to direct sunlight on the control desk - and may be touched hundreds of times during a shift.
Three groups of requirements determine whether a component can be accepted: mechanical resistance to vibration and shock (testing in accordance with EN 61373), electrical and environmental properties of electronic equipment for rolling stock (EN 50155), and fire behaviour of materials (EN 45545-2). Electromagnetic compatibility is also essential because the cab is adjacent to traction circuits and radio systems.
Typical equipment installed in control desks and cab cabinets includes: illuminated pushbuttons and switches, visual and audible indicators, circuit breakers protecting auxiliary circuits, interface relays coupling control circuits to actuators, signal connectors and onboard printers.
Selection criteria for this area:
EN 50155 defines requirements for electronic equipment used on rolling stock - supply-voltage ranges and interruptions, operating temperatures, humidity, vibration and tests. A component's declaration of compliance relates to its category and class; checking the actual tested conditions in the datasheet is more important than the mere presence of the standard number.
Their trip characteristic depends on current and fluid flow in the damping mechanism rather than on heating a bimetal element, so it remains stable over a wide ambient-temperature range. In a vehicle, where cabinet temperature may vary by several tens of degrees, a thermal breaker would require derating or trip-setting correction.
EN 45545-2 defines requirements for materials and products according to the vehicle's operating and design categories, expressed as hazard levels and requirement sets. Instead of using a single list of approved materials, selection depends on where the component is installed and what type of vehicle it is used in.
Only if the manufacturer confirms the required railway version. A device compliant with IEC 60947 is not equivalent to one declared compliant with EN 50155, EN 61373 and EN 45545-2 - lack of these declarations usually prevents vehicle approval rather than merely complicating the specification.