TRANSPORT & ASSETS / RAIL & ROLLING STOCK
EN 50155 Rail & Rolling Stock Networking
Networks that survive the vibration, EMC and heat of rail
The short answer
What networking hardware does rolling stock and trackside need?
Rolling stock and trackside networks need EN 50155 rated managed Ethernet switches, M12 connectors that cannot vibrate loose, and fanless wide temperature operation from minus 40 to 75 Celsius. Ring protocols such as ERPS recover a broken link in milliseconds, so CCTV, passenger information and condition data survive a single cable or switch fault.
Rolling stock and trackside are among the most hostile places to put an Ethernet network: constant shock and vibration, brutal EMC from traction systems, swings from sub-zero to engine-bay heat, and condensation that destroys RJ45 connectors. Commercial switches fail certification and fail in service, and a dropped link between a carriage, a depot or a signalling cabinet can stop a unit from entering service. You need networking hardware that is type-tested to rail standards, mechanically locked, and able to carry CCTV, passenger information, train control and condition-monitoring traffic without dropping a frame.
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The difference
EN 50155 Ethernet switch: what changes the day it goes live
Rolling stock and trackside are among the most hostile places to put an Ethernet network: constant shock and vibration, brutal EMC from traction systems, swings from sub-zero to engine-bay heat, and condensation that destroys RJ45 connectors. Commercial switches fail certification and fail in service, and a dropped link between a carriage, a depot or a signalling cabinet can stop a unit from entering service. You need networking hardware that is type-tested to rail standards, mechanically locked, and able to carry CCTV, passenger information, train control and condition-monitoring traffic without dropping a frame.
- Managed Ethernet that holds link through IEC 61373 shock and vibration with M12 connectors that cannot work loose on a moving vehicle
- Carriage-to-carriage and train-to-ground rings that self-heal in milliseconds, so CCTV, PIS and control traffic survive a single cable or switch fault
- EN 50121-rated EMC behaviour that passes type approval first time instead of being rejected at the test house
- Wide-temperature, fanless operation from depot cold-start to summer engine-bay heat with no moving parts to fail
What you get
- 01
Managed Ethernet that holds link through IEC 61373 shock and vibration with M12 connectors that cannot work loose on a moving vehicle
- 02
Carriage-to-carriage and train-to-ground rings that self-heal in milliseconds, so CCTV, PIS and control traffic survive a single cable or switch fault
- 03
EN 50121-rated EMC behaviour that passes type approval first time instead of being rejected at the test house
- 04
Wide-temperature, fanless operation from depot cold-start to summer engine-bay heat with no moving parts to fail
About the rail standards on this page
What this covers
Rugged managed and unmanaged Ethernet switching, M12 connectorised, with extended temperature ranges suited to trackside cabinets and rolling stock enclosures.
What it does not
A blanket EN 50155 claim on every product shown. Rail approvals are per model and per revision, and we will not assert one on a page that a datasheet does not substantiate. Where a specific model carries EN 50155, EN 50121 or IEC 61850-3 we will send you the manufacturer certificate.
Tell us the standard and the clause your specification cites and we will come back with the models that actually hold it, in writing.
The full stack, applied here
A hot axle caught trackside, not on the line
Every Indiott build runs all five layers as one accountable system. Follow a single bogie hot-box from the sensor that catches it to the report that proves it.
Vibration and temperature sensors on bogies, axle boxes and traction gear read condition on the move, flagging a hot-box or a bearing going bad before it fails.
Hands a live reading to CONNECT ↓
EN 50155 managed switches with M12 connectors form the carriage backbone, and a cellular router carries the train-to-ground link into the depot.
Hands a signed frame to SECURE ↓
VLAN segmentation and managed access keep passenger CCTV, PIS and condition data in separate domains, so a fault on one cannot reach the safety-relevant network.
Hands a trusted stream to CONTROL ↓
The stack already carries control traffic: remote IO can latch a depot alarm or trigger a maintenance hold the moment a threshold is breached in service.
Hands an action and proof to MANAGE ↓
Ring-status, port-error and hot-box telemetry land in a dashboard that feeds the depot, so a marginal switch or a warm axle is flagged at maintenance.
The loop is closed ✓
How teams start
From a single pilot to the whole portfolio
You do not boil the ocean. Nearly every rollout runs the same four moves, and you own a working, evidenced result at the end of the first one.
Scope & risk map
We walk the sites, list the assets and pin the one constraint that matters, then agree what a good result looks like before a single sensor is bought.
Pilot on one site
A focused set of sensors goes onto one site or asset group, live on our telemetry and dashboards, wired to the people who need the alert.
Validate & standardise
We tune thresholds, kill false positives, confirm the integration into your SCADA, BMS or CAFM, and write the standard design down so it repeats.
Scale the portfolio
The proven design rolls out across the estate, reusing the same hardware standards and data models so every site reads the same way.
The EN 50155 Ethernet switch kit we deploy
Full catalogue
ATOP EH7506 Industrial Managed Ethernet Switch
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ATOP EH7508 Industrial Managed Ethernet Switch
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ATOP EH7512 Industrial Managed Ethernet Switch
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ATOP EHG7307 Industrial Managed Ethernet Switch
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ATOP MB5901 Rugged Serial to Ethernet Modbus Gateway
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ATOP MB5901B Cellular Serial to Ethernet Modbus Gateway
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ATOP SE5901 Rugged Serial to Ethernet Device Server
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ATOP SF63 Serial to Fibre Media Converter
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| Model | Key specification | Price ex VAT | Availability |
|---|---|---|---|
| ATOP EH7506 Industrial Managed Ethernet Switch EH7506 | Port Layout: 4 × 10/100BASE-T(X) RJ45 + 2 × 100/1000 SFP, PoE on up to 4 ports | Price on request | Quote only |
| ATOP EH7508 Industrial Managed Ethernet Switch EH7508 | Gigabit Uplinks: 4 × combo ports (10/100/1000BASE-T(X) RJ45 or 100/1000BASE-X SFP) | Price on request | Quote only |
| ATOP EH7512 Industrial Managed Ethernet Switch EH7512 | Port Layout: 8 × 10/100 RJ45 + 4 × Gigabit combo uplinks, PoE on up to 8 ports | Price on request | Quote only |
| ATOP EHG7307 Industrial Managed Ethernet Switch EHG7307 | SFP fibre uplink ports: 2 x SFP (SFP1: 1000 Mbps / SFP2: 100/1000 Mbps), alongside 5 x 10/100/1000 RJ45 | Price on request | Quote only |
| ATOP MB5901 Rugged Serial to Ethernet Modbus Gateway MB5901 | Ethernet connector ports: RJ45 x 2 (dual-port, with 802.1D-2004 RSTP redundancy) | Price on request | Quote only |
| ATOP MB5901B Cellular Serial to Ethernet Modbus Gateway MB5901B | Cellular bands (EU version): FDD LTE 2100/1800/850/2600/900/800MHz (B1/B3/B5/B7/B8/B20) | Price on request | Quote only |
| ATOP SE5901 Rugged Serial to Ethernet Device Server SE5901 | Ethernet Ports and Redundancy: 2 × 10/100BASE-T(X) RJ45 with RSTP, -40°C to +85°C | Price on request | Quote only |
| ATOP SF63 Serial to Fibre Media Converter SF63 | Max. Transmission Distance: 2 km multi-mode, 30 km single-mode | Price on request | Quote only |
Brands in this kit: Atop Technologies
Why Indiott
A specialist stack, not a box-shifter
Brand-agnostic by design
We pick the best of each brand for the layer and the environment, not one vendor catalogue. Milesight, AquaIoT, Atop, Browan, SpecSens and Urban.io, chosen on merit.
The whole stack, one supplier
Sensing, connectivity, OT security, control and the dashboard come from one accountable team, so there is no finger-pointing when something needs to talk to something else.
Specified and supported in Britain
UK-based engineers scope the site, quote the kit and stand behind it, with compliance mapped to the regimes your auditors actually cite.
Honest kit, honest pricing
Prices are shown where we can, quoted fast where we cannot, and you get a straight answer and a bill of materials within one working day.
DEPLOYED IN THE FIELD
Compliance this answers to
| Standard | What it requires |
|---|---|
| EN 50155 | the rolling-stock electronics standard; switches are type-tested for power, temperature and supply-interruption behaviour so they survive on-vehicle conditions and pass approval |
| EN 50121-3-2 / EN 50121-4 | railway EMC for on-board apparatus and for trackside signalling and telecoms, so the network neither emits nor succumbs to traction interference |
| IEC 61373 | shock and vibration category testing so connectors and PCBs hold up to years of running gear |
| EN 45545 | rail fire-behaviour and material requirements for equipment fitted inside passenger vehicles |
What it costs, roughly
A condition-monitoring and CCTV backbone fit-out for a small multiple-unit fleet typically runs into low tens of thousands per vehicle set in hardware, depending on the number of M12 managed switches per carriage, whether you need cellular train-to-ground routers, and how much legacy serial equipment must be gatewayed in; trackside cabinet networking is costed per cabinet. Type approval and integration labour sit on top. Exact figures come back, against your unit count, carriage layout and standards scope, within one working day.
Frequently asked questions
Which switches are actually certified to EN 50155?
The RHG7528 rackmount managed switch is EN 50155 certified, and the M12 EMG8305 meets the essential sections covering operating temperature, power input voltage, EMC and vibration. The DIN-rail EHG7504, EHG7508, EHG7604 and EHG7608 are environmentally tested for railway supply conditions. We supply the declarations and test reports your approval body asks for.
Do I need M12 connectors, or will RJ45 do?
Use M12 wherever vibration, dust or water reaches the connector. The EMG8305 gives five Gigabit M12 ports in an IP67 body, and the EMG8508 gives eight Gigabit M12 ports with PoE, its redundant power and relay alarm landing on an S-coded M12. RJ45 remains acceptable inside a sealed cabinet interior.
How quickly does a carriage or trackside ring recover from a cable fault?
Ring protocols reconverge in milliseconds rather than the seconds spanning tree takes. The RHG7528 supports ITU-T G.8032 ERPS and recovers within 25 ms at full load with 250 devices, while the EHG75xx DIN-rail range supports RSTP, ERPS and MRP client. That keeps CCTV and passenger information streams alive through a single break.
Can the same switch power CCTV and passenger information screens?
Yes, over PoE. The EMG8508 supplies up to 30W per M12 port with a 240W total budget, the DIN-rail EHG7508 also gives 240W across eight PoE ports, and the RHG7528 rackmount scales to 24 Gigabit PoE and PoE+ ports with a 720W budget. Size the switch against total wattage, not port count.
How do legacy serial and Modbus signalling devices join the network?
Through a rugged serial server. The SE8502-M12 is a two-port IP68 unit with metal M12 connectors, certified to EN 50155 and EN 50121-4, rated minus 40 to 75 Celsius, and supporting TCP server, TCP client, UDP and VirtualCOM link modes. Existing serial equipment stays in service on the same managed backbone instead of being replaced.
What does it cost, and how do I get train to ground backhaul?
Rail switches and serial servers are configured per position, so they are quoted rather than listed: send your carriage or cabinet layout and figures come back within one working day. For train to ground and depot backhaul, the Milesight UR35 industrial cellular router is from £149.63 ex VAT and the UR75 5G router is from £460.12.
Are all these switches EN 50155 approved?
Rail approvals are per model and per revision, so we will not assert a blanket EN 50155 claim across a range. What we supply is rugged managed and unmanaged Ethernet switching, M12 connectorised, with extended temperature ranges suited to trackside cabinets and rolling stock enclosures. Tell us the standard and clause your specification cites — EN 50155, EN 50121 or IEC 61850-3 — and we will come back with the models that hold it and send the manufacturer certificate.
Related
Buying this in the UK
- Supplied by Indiott, a trading name of PSI Technologies Limited (Companies House 03689664, VAT GB 730 2340 83), Hampshire, United Kingdom.
- Every price is published ex VAT at indiott.com — no quote needed to see it.
- Typically dispatched within 14 working days from the UK, on a VAT invoice.
- Call 023 9223 3611 or request a quote.
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Next step
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