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Designed and type-tested to EN 50155 and its companion standards; vehicle-level type approval is completed by the system integrator.
Rail-grade engineering, not industrial-by-guess
EN 50155 is the European standard for electronic equipment on rolling stock. It defines the environmental and electrical envelope a device must survive inside a vehicle — wide temperature swing, a fluctuating DC supply, EMC, and the mechanical duty of the track. We engineer the display to that envelope rather than bolting industrial specs onto a screen and calling it rail-ready.
The standard is more than a single number. Its temperature classes run T1 (−25 °C to +55 °C), T2 (−40 °C to +55 °C), T3 (−25 °C to +70 °C) and TX (−40 °C to +85 °C); carriage-mounted displays typically sit in T1–T3. The DC supply is never clean: EN 50155 requires continuous operation across 0.7–1.25× nominal, ride-through of transients to 0.6× at 100 ms and 1.4× at 1 s, and hold through brief supply interruptions. Nominal rails are 24, 48, 72 and 110 VDC — so a wide-input power stage is mandatory, not optional.
And EN 50155 is never alone. A credible rail display also answers EN 50121-3-2 (EMC), EN 50124-1 (insulation coordination), EN 50125-1 (ambient environment), EN 45545-2 (fire) and IEC 61373 (shock and vibration). A datasheet that names only “EN 50155” but stays silent on the companions has not been fully qualified. We design to the whole set; vehicle-level type approval is completed by the system integrator.
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Body-mounted displays are qualified to IEC 61373 Category 1 (typically Class 1B).
Survives the track, not just the bench
Every kilometre of rail vibrates the carriage body; every passing train transmits low-frequency shock through the structure. IEC 61373 grades this by where the equipment is mounted: Category 1 (body-mounted, split into 1A direct and 1B inside a box), Category 2 (bogie-mounted) and Category 3 (axle-mounted), with severity rising 1 → 2 → 3. A saloon display is body-mounted, so it is qualified to Category 1 — typically Class 1B.
Qualification is not a single shake. IEC 61373 sequences a functional random-vibration test (powered, at least 10 minutes per axis), a simulated long-life test (around 15 hours total, 5 hours per axis, to prove structural integrity), and half-sine shock pulses. We pair this with EPDM dampening gaskets at the panel-to-enclosure interface — they absorb the shockwaves and seal against moisture — and screw-lock M12 I/O that cannot walk loose over a decade of service.
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Fire-retardant, low-smoke enclosures; the required HL is set by the operator.
Low smoke, low toxicity, by design
Inside a confined carriage, a fire is a smoke-and-toxicity event before it is a flame event. EN 45545-2 sets the fire behaviour of materials and components on railway vehicles. It sorts materials into 26 end-use categories (R1–R26) and three hazard levels — HL1 (lowest), HL2 and HL3 (strictest, and mandatory for new EU metro projects). The tests measure smoke density (IEC 61034-2), flame spread (IEC 60332) and toxicity (EN 50305); low-smoke zero-halogen (LSZH) compounds are required at every level.
We specify fire-retardant, low-smoke enclosures and harnesses so the display contributes as little to the fire load as the vehicle’s hazard level demands. The exact HL the project needs is set by the operator and the line’s operation category — we build to meet it and confirm the rating on request.
Bright enough, never blinding
A carriage interior is a controlled-lighting environment. Ceiling displays sit comfortably at 500–1,000 nits; door-area and side panels at 400–700 nits. Only door headers facing a sunlit vestibule need to climb toward 1,500 nits — and even there we stay well under our 5,000-nit ceiling. (We build LCD only; the old dot-matrix LED boards are legacy reference, not our product.)
An ambient-light sensor auto-dims the panel at night, cutting power and preventing eye fatigue on a 30-minute ride. Brightness is a comfort and contrast problem in here, not a sunlight-war.
Open hardware, your software
Each unit ships with screw-lock M12 I/O, Ethernet and a wide 24–110 VDC input, plus an open SDK/API. Your existing PIS, CMS or signage controller drives the screen — we do not lock you into a stack, and we do not sell software. We are a display-hardware manufacturer; the navigation, ticketing and passenger-information logic stays with you or your integrator.
That split is deliberate. We own the panel, the enclosure, the thermal path and the rail-grade qualification. You own the content and the system around it. Integration is a cable and an API, not a negotiation.
