Two Way Radios for Trains and How UK Rail Teams Use Push to Talk

Two way radios for trains are push to talk radios that station, depot, security and on-board teams use to coordinate rail operations. In the UK, train drivers and signallers talk over GSM-R, the railway’s own radio network, while operational teams use licensed DMR radios, Push to Talk over Cellular (PoC) or multi-mode radios that run both.

On a weekday morning a service gets diverted. The platform team needs to know before passengers start asking. A security officer on board wants backup at the next stop. The depot needs to know the unit it was expecting won’t arrive until later. And the duty manager wants to hear all of it without ringing four people.

On the railway, those updates often have to travel between sites that are miles apart, and they have to arrive before the next train does. This guide looks at how rail teams use radios to do that, how DMR and PoC compare for rail work, what happens in tunnels and cuttings, and where push to talk sits next to GSM-R and the Rule Book.

What Rail Teams Use Two Way Radios For

Rail teams use two way radios to run stations, depots and on-board services from one hour to the next. Push to talk lets one person reach a whole team with a single press. It earns its keep during disruption, when platform changes, crowding and replacement buses all have to be sorted at once.

A phone call reaches one person. A radio reaches the whole talkgroup, so everyone hears a platform change or a security call at the same moment. With phones, the last person in the chain can find out ten minutes after the first. On the railway those minutes cost money, because a communication problem during a line closure or a possession can hold up the whole job.

Who Uses Radios Across Rail Operations

Radios are used by almost everyone who keeps a railway running outside the driving cab, from station managers and platform staff to security officers, depot engineers and control room teams. Most operators split users into a small number of talkgroups, with managers able to hear and reach every group when needed.

Keep the number of talkgroups small. Most operations get by with one each for stations, depots, security and management. Managers join several so they can follow what’s going on without anyone having to call them.

Where Push to Talk Fits Alongside GSM-R and Rail Safety Systems

Push to talk handles the operational communication around the railway. It does not replace GSM-R, the railway’s own radio system for communication between drivers and signallers, and it doesn’t replace the communication protocols set out in the Rule Book. Rail operators use push to talk alongside these systems, for the conversations they don’t cover.

GSM-R is the railway’s own radio network. It connects train cabs with signallers across Great Britain. It runs on 2G technology, and Network Rail is preparing to replace it with the Future Railway Mobile Communication System (FRMCS), which is based on 5G. Neither system was built for a station team asking the depot when a unit will be ready, or a security officer calling the control room. Those conversations go over push to talk.

Some safety-critical communication has its own rules. Network Rail’s Infrastructure Plant Manual requires a full duplex system between a Machine Controller and an on-track plant operator, so both can talk and listen at the same time. Push to talk radios, DMR and PoC alike, are half duplex, so only one person speaks at a time. That rules them out for this job. Check any rail radio plan against the Rule Book and the standards that cover the work.

DMR vs PoC vs Multi-Mode Radios for Rail

Rail operators generally choose between licensed DMR radios, Push to Talk over Cellular (PoC) and multi-mode radios that combine both. DMR works without a mobile network but is limited to radio range. PoC reaches anywhere with mobile coverage and adds GPS and central oversight. Multi-mode radios give staff both on one handset.

Licensed DMR radios don’t use mobile networks, so they keep working where there’s no signal. Range is the catch. It’s typically 2 to 5 km line of sight per site, and going further means repeaters and more Ofcom licensing. That’s fine for one depot or station. Linking a whole route that way gets expensive.

PoC radios run over mobile networks and WiFi instead of radio frequencies. A station in Leeds, a depot in Manchester and a control room in York can all share the same talkgroups, and security officers on board a moving train stay connected as it travels. Ofcom predicts that 96% of the UK landmass has good outdoor 4G coverage from at least one mobile operator. The trade off is that PoC depends on that coverage, and railways run through tunnels and cuttings where signal drops.

Multi-mode radios such as the iPTT P600 run DMR and PoC on one handset. Staff use PoC for network-wide reach and switch to DMR for direct radio-to-radio contact where mobile signal isn’t available.

Coverage in Tunnels, Cuttings and Rural Lines

Railways run through tunnels, deep cuttings and rural stretches where mobile signal is weak or absent, so coverage needs checking along the actual routes and sites before rollout. The usual answer is a mix of PoC where there is signal, WiFi where a station or depot has it, and DMR on a multi-mode radio where neither reaches.

GSM-R has its own trackside masts, and Network Rail designed its coverage to include tunnels, cuttings and stations. Public mobile networks, which PoC relies on, weren’t built around the railway in the same way. National coverage figures for them describe outdoor landmass and say nothing about the inside of a tunnel or the bottom of a cutting, where rock, concrete and steep sides block mobile signal. Anyone planning PoC for on-board or station use should assume there will be gaps and plan for them.

iPTT deals with the gaps in a few ways.

1. Check coverage on the real routes and sites. Map where staff actually work, including stations below ground, depots, tunnels and the most rural parts of the route, and test handsets there.
2. Bring WiFi into the tunnel. WiFi nodes are fitted at the outskirts of the tunnel, and leaky feeder cable carries the signal from outside down through the tunnel itself.
3. Use a router with cable repeaters. An external router picks up signal outside, and cable repeaters distribute it through the tunnel.
4. Use multi-mode radios where there’s no signal at all. A DMR and PoC handset lets staff keep talking directly to nearby colleagues on DMR when PoC drops out.

With WiFi or repeaters in place, the iPTT Dispatcher stays in contact with devices inside the tunnel. GPS is the exception. Positions can drop out deep inside a tunnel and pick up again once the worker comes out.

iPTT’s SIM roams across four UK mobile networks for both voice calls and data, so each handset uses whichever network is strongest at that point on the route rather than being tied to one operator.

Safety Features for Lone and Isolated Rail Staff

Many rail staff work alone or out of sight for part of their shift, from security officers on late trains to staff at unstaffed or quiet stations and engineers in large depots. Radios with man down, lone worker mode, an emergency button and GPS give those staff a direct line to help when something goes wrong.

Man down raises an alarm automatically if a worker falls or stops moving, which covers the situations where someone is hurt and can’t call for help themselves. Lone worker mode raises an alarm if a worker misses a check-in. An emergency button lets a worker raise the alarm instantly during a confrontation, and GPS shows a responder exactly where they are, including on a moving train. For the wider picture on keeping isolated staff safe, see our guide to lone worker communication systems in the UK.

These features cover personal safety and incident response. Anyone working on or near the line still needs the protection arrangements set out in their safe system of work.

Managing Rail Radios Across a Network

Rail operators run hundreds of radios across many sites, so central management matters as much as the handsets. Dispatcher software shows where staff are and lets a control room talk to any group, and mobile device management (MDM) controls what each handset can be used for.

The iPTT Dispatcher gives a control room live GPS positions on a map and lets operators talk to individual users or whole talkgroups. That means a control room can see which security officer is closest to an incident, or which station team needs extra staff, and act on it straight away. For more on how control rooms manage field teams, see our guide to radio dispatch console systems.

The Dispatcher also gives managers business intelligence and command and control across every site and team.

For rail teams, iPTT supplies the Samsung Galaxy XCover7, a rugged Android handset, managed through Samsung Knox. Knox lets administrators choose which apps, websites and phone numbers each device can reach. A handset locked down this way is harder to misuse, and staff don’t end up treating it as a second phone.

What to Check Before Rolling Out Rail Radios

The right rail radio system depends on where staff work, how far communication needs to reach, and how it fits around the safety systems already in place. Work through these points before choosing hardware.

Before you commit. No system guarantees perfect coverage across a rail network. Trial any option on your own routes and sites, including tunnels and below-ground stations, before rolling it out.

How iPTT Can Support Rail Operations

iPTT supplies push to talk communication to train operators, rail security contractors, Network Rail contractors and depots, and is currently working with a major rail company through ESS. Rail teams use the Samsung Galaxy XCover7 with Knox device management, the iPTT PoC app and a SIM that carries voice calls and data across four UK networks.

That combination has put staff in contact on sites that previously had no usable coverage, where they can now take calls and use push to talk. In tunnels, iPTT adds WiFi with leaky feeder cable or routers with cable repeaters, and the iPTT Dispatcher gives the control room one view of every team.

“Communication problems on the railway cost time and money, and they put staff at risk. Our job is to get teams operational from the moment they arrive, even on sites that never had coverage before.”

iPTT can check coverage along your routes and provide demo units, so your teams can test the setup in the places they actually work before anything is bought.

Conclusion

Two way radios carry the everyday conversations that keep a railway running, between stations, depots, trains and the control room. With the industry focused on running the railway safely, they also matter for the people doing the work, giving security officers and staff working alone a quick way to call for help. GSM-R and the Rule Book still cover the safety-critical communication.

For a single depot or station, DMR does the job. For teams spread along a route, PoC reaches further. Operations that need both pick a multi-mode radio. Before choosing any of them, test the handsets on your own routes, tunnels included.

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