16 AI driver voices
Distinct male voices across British, Indian, Irish and Australian accents — Google Chirp 3 HD via the Online Voice Server, with Edge TTS and Windows TTS as offline fallbacks.
Built for SimSig — Windows 10/11
Sound like the real signaller on every SimSig session.
RailComms is a virtual GSM-R radio that handles every phone call with your drivers, signallers and shunters — with AI driver voices, authentic radio FX, push-to-talk voice replies, and live multiplayer calls between players.
- One-time purchase · no subscription
- Free updates for life
- Windows 10 / 11
16 AI driver voices
180–3.4k Hz GSM-R bandpass
PTT Voice replies
Features
Everything a real signaller has — without the headset.
Built specifically for SimSig. Realistic call types, authentic radio audio, and the workflow tools that make running a busy panel actually fun.
Authentic GSM-R radio FX
Driver calls play through a 180–3400 Hz bandpass with PTT mic clicks, subtle carrier hiss, and per-voice pitch variation. Office calls (signaller, station, yard) play clean.
Push-to-Talk voice replies
Hold Left Ctrl and speak. Cloud STT with railway phrase boost — NATO phonetic, signal numbers, common reply terms — matches your speech to the right reply option.
Background ambience
Cab, yard, station, office and trackside loops — only audible while the other party is speaking. Silent during your PTT and idle waiting, so the radio sounds real, not noisy.
Multiplayer voice calls
Player-to-player WebRTC calls with automatic LAN peer discovery and a cloud relay fallback. Dial real signallers from the Global phonebook — peer-to-peer for low latency.
Train alerts & auto-wait
Trains waiting at red signals appear with repeating notifications. Queue a one-shot "Wait 5 minutes" reply for the driver's next call — fires once, then they reach you normally.
Browser remote control
Drive RailComms from an iPad or any browser on your network. Mirrors the host UI live: answer/hangup, replies, alerts, phonebook, message log. Audio plays on the host PC.
SimSig dialog cleanup
Failure dialogs auto-dismissed. On exit, RailComms restores SimSig to a clean state — moves off-screen dialogs back, clears stale calls, unmutes audio.
How it works
From install to answering your first call in 60 seconds.
SimSig fires a phone call into RailComms over the gateway. RailComms generates a realistic spoken message, you reply by voice or click, and SimSig stays in sync — all hands-free.
- 01
Install & connect
Run the Windows installer, enter your SimSig initials, and click Connect. The setup wizard walks you through audio devices and the Online Voice Server in under a minute.
- 02
A driver calls
You hear ringing. The Incoming tab shows their headcode and signal. Hit Answer — the driver speaks with full GSM-R radio FX and cab ambience playing in the background.
- 03
Reply by voice or click
Hold Left Ctrl and speak — Google STT matches what you said to the right reply (Wait 5, Pass at danger, examine the line…). Or click. RailComms speaks back, then closes the call.
Connects to the SimSig gateway over STOMP. Requires SimSig with Enable Remote Control turned on. Detect-Gateway button finds the IP automatically.
Realism
Every call type that matters — voiced like the real thing.
RailComms generates the right wording for the right caller. Drivers get full GSM-R radio FX and cab noise. Signallers and office staff sound clean. Shunters get yard ambience. The signaller-out close is automatic.
Driver Cab — radio FX
Hello, this is 1A45 standing at signal MP217. The signal is showing no aspect.
Signaller Office — clean audio
Hello panel, this is Westbury Signaller. I have 2C19 running early via Frome…
Shunter Yard ambience
Hello, this is the Shunter in Reading West Yard. Train 5O42 is ready.
Crew Station ambience
Hello, this is 1P30 at Bristol Temple Meads. We are waiting for the train to arrive…
MOM Failure fixed
Hello Signaller, this is the MOM down at the points failure in the Up Loop. Good news — fixed.
Third party Token hut / GF
Hello panel, this is the Token Hut at Severn Beach…
Pricing
One price. One file. Yours forever.
No subscription. No login. No telemetry. Buy it once, install it on your machine, and get every future update free.
Lifetime licence
£19.99 one-time
Everything in RailComms. No upsells, no tiers.
Buy RailComms- 16 AI driver voices (Online Voice Server)
- GSM-R radio FX, ambience, ringtone
- Cloud speech recognition for voice replies
- Multiplayer WebRTC voice calls
- Browser remote control (iPad / tablet)
- Train alerts, auto-wait, failure detection
- SimSig dialog cleanup on exit
- Free updates for life
Windows 10 / 11. Internet recommended for AI voices and STT (offline fallbacks included).
FAQ
Common questions.
Do I need SimSig to run RailComms?
Yes. RailComms is a companion to SimSig — it connects to the SimSig gateway over STOMP and reads incoming calls from SimSig's phone dialog. Without SimSig running, there are no calls to handle.
Will the AI voices work offline?
The headline voices (Google Chirp 3 HD via the Online Voice Server) need internet. RailComms ships with two offline fallbacks: Microsoft Edge TTS (good quality, needs internet) and Windows TTS (basic, fully offline).
How does the multiplayer voice calling work?
Player-to-player calls use WebRTC, peer-to-peer for low latency. RailComms automatically discovers other players on your LAN and falls back to a cloud relay if a direct connection isn't possible.
Can I use it from an iPad while SimSig runs on the PC?
Yes — Browser Access is enabled by default. Open the URL shown in Settings from any device on your network and you get a live mirror of the host UI: answer, reply, dial, alerts, message log. Audio always plays on the host PC.
Is RailComms affiliated with SimSig or Network Rail?
No. RailComms is an independent, fan-made companion tool. It is not affiliated with, endorsed by, or sponsored by SimSig, Network Rail, or any railway operator or authority.
What do I get for £19.99?
A perpetual licence for the current and all future versions of RailComms, with no subscription. The Online Voice Server is included — there are no per-call fees or usage limits.
Refunds?
If RailComms doesn't work for you, email me within 14 days of purchase and I'll refund you. Software is non-returnable but I'd rather you had your money back than be unhappy.
Does it work on macOS or Linux?
Not currently. RailComms is Windows 10/11 only because it integrates tightly with SimSig's native window — and SimSig itself is Windows-only.