EN 50155 Quick Reference for Railway Displays
Specifying displays for rolling stock? This page summarises the EN 50155 temperature classes, supply voltage codes and the EN 61373 shock & vibration categories that railway tenders usually reference — in plain language, at a glance.
| EN 50155 temperature classes (ambient around the equipment) | ||
|---|---|---|
| Class | Operating range | Typical use |
| T1 | −25 … +55 °C | Indoor saloon / driver cab equipment |
| T2 | −40 … +70 °C | Exterior-adjacent and unheated compartments |
| T3 | −25 … +70 °C | Standard on-board equipment |
| Tx | −40 … +85 °C | Harsh locations, roof / underframe zones |
| EN 50155 supply voltage codes (nominal) | ||
|---|---|---|
| Code | Nominal voltage | Operating window (simplified) |
| 24 V | 24 V DC | 16.8 – 32 V |
| 48 V | 48 V DC | 33.6 – 66 V |
| 72 V | 72 V DC | 50.4 – 99 V |
| 110 V | 110 V DC | 77 – 137.5 V |
| EN 61373 shock & vibration categories | |
|---|---|
| Category | Mounting location example |
| Class 1 — car body | Mounted inside the vehicle body |
| Class 2 — bogie | Mounted on the bogie frame |
| Class 3 — axle-mounted | Mounted on axle / wheelset |
This is a system-level summary for orientation only — the published standards and your certification body define the actual requirements. Talk to us about display solutions engineered for railway cabin and door-line applications.
FAQ
What is EN 50155?
EN 50155 is the European standard for electronic equipment used on railway rolling stock. It covers operating temperature classes, supply voltage tolerance, insulation, EMC and environmental testing for on-board electronics such as displays and HMI units.
Which EN 50155 temperature class should I specify?
Match the class to where the equipment actually sits: T1/T3 cover heated cab and saloon equipment, T2 and Tx are needed for unheated or exterior-adjacent zones. Wide-temperature TFT LCD modules are specified accordingly.
Is EN 50155 the same as EN 61373?
No. EN 50155 defines the electrical and climatic requirements; EN 61373 defines the shock and vibration test levels depending on where the unit is mounted — car body, bogie or axle. Displays are usually qualified as Class 1 equipment.
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