M12 Rail Ethernet Cable for Rolling Stock and Bus Networks

Last updated: 7 September 2026

This m12 rail ethernet cable is built for vehicle backbones: train and tram Ethernet consist and backbone networks, onboard CCTV, passenger information screens and the infotainment servers now fitted to coaches and long-distance buses. Electrically it is the same eight-position X-coded interface used in factories. Everything that differs is in the jacket and the documentation, because a cable that is acceptable inside a machine cabinet is not automatically acceptable inside a passenger saloon.

Why vehicle cable is a different product

The governing requirement in a rail vehicle is what happens in a fire. A halogenated jacket releases dense, corrosive smoke, and in a tunnel or a sealed saloon the smoke and the acidity matter more than the flame spread. Competitor rail ranges use electron-beam crosslinked halogen-free compounds, which hold their mechanical properties at temperature and do not rely on halogen chemistry for flame retardancy. Fire, smoke and toxicity performance to EN 45545-2 is quoted in competitor data at hazard levels HL1 to HL3. We are not stating a hazard level for our part until the material has its own test report.

Vibration and temperature

A vehicle cable lives in a different mechanical world from a factory drop. It sees continuous random vibration from the bogies and the traction package, thermal cycling between a heated saloon and an underframe at winter ambient, and a service life measured in decades rather than production seasons. Shock and vibration qualification to IEC 61373 and a range from -40 to +90 C are quoted for comparable products; both need supplier test evidence before they go on a datasheet, and both should be checked against where the run actually sits, since an underframe route is not the same duty as an interior route.

Where the runs go

• Ethernet consist network and backbone links between vehicles
• Onboard CCTV camera drops and video recorders
• Passenger information displays and infotainment servers on coaches and buses

Specifying a length

These assemblies are normally ordered at fixed lengths of 1, 2, 5 and 10 meters rather than cut on site, because the transmission performance of a four-pair cable is set by the termination as much as by the cable. X-coding keeps the four pairs separated to the mating face, which is what makes 10 gigabit transmission possible over this interface; a poorly terminated field plug will not hold it. If you need a length outside the standard set, tell us the channel budget you have to meet and we will confirm what is achievable.

Documentation status

Fire and smoke classifications, the vibration category, the temperature range and the Cat7 capability quoted for comparable products are leads from public competitor data, not verified values for our assemblies. Ask for the material declaration and the test reports early.

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Frequently Asked Questions