Train Speed Test — Real-Time GPS Browser Speedometer
Measure the speed of moving trains in real time using your phone's GPS. No installs. No signup. Allow location and ride.
Shows: Live speed · Max speed · Average speed · Distance · Journey time · GPS accuracy
Works on iPhone, Android, and tablets. Best performance near a window seat.
How It Works
Your device samples GPS coordinates multiple times per second. As the train moves, the distance between each position update is calculated and converted into speed. The display refreshes continuously and stays active for the duration of your journey.
Why People Use This Tool
- ✓Compare published timetable speed vs actual speed — Schedules show averages. GPS shows what's happening right now.
- ✓Track acceleration and braking curves — Watch the train ramp up from a stop and slow for approaches.
- ✓Measure cruise speed on long-distance runs — See exactly what speed the train holds between stations.
- ✓Test high-speed rail performance — Shinkansen, TGV, ICE, Eurostar. Verify if the train hits its rated max.
- ✓Log commuter route characteristics — Some suburban lines never hit their max. Now you have the data.
Train Speed Characteristics
Trains behave differently from cars. Here's what to expect:
- Acceleration is gradual
Electric trains reach cruising speed over 2-5 minutes. The acceleration curve is smooth and visible.
- Cruise segments are stable
Trains maintain constant speed for long stretches. Readings hold at 160, 200, or 280 km/h with minimal variation.
- Station spacing defines speed profile
Lines with stations every 5 km never reach top speed. Long-haul routes allow sustained velocity.
- High-speed corridors exceed 250 km/h
Dedicated high-speed lines in Japan, France, Germany, China cruise above 280 km/h.
GPS Performance on Trains
- Sit near a window
Metal train shells block satellite signals. A window seat gives GPS a clear view of the sky.
- Tunnels freeze the reading
GPS doesn't work underground. The display holds last known speed until you exit.
- Urban viaducts cause multipath
Tall buildings near elevated tracks reflect signals, causing brief inaccuracies.
- Speed improves GPS accuracy
At 60+ km/h, GPS uses Doppler shift for velocity. Motion actually helps accuracy.
Works With These Train Types
High-Speed Rail
Shinkansen, TGV, ICE, Eurostar, CRH, KTX
Commuter / Regional
S-Bahn, RER, Caltrain, Sydney Trains
Intercity / Long-Distance
Amtrak, VIA Rail, DB IC, Rajdhani
Light Rail / Trams
Works outdoors. Underground sections freeze.
Subway / Metro
Limited. Only works on elevated/open-air sections.
Diesel / Electric
Both work. Electric accelerates faster.
Famous Train Speed Benchmarks
Typical maximum service speeds for reference:
| Train | Country | Max Speed |
|---|---|---|
| Shinkansen N700S | Japan | 285 km/h |
| TGV Duplex | France | 320 km/h |
| ICE 3 | Germany | 300 km/h |
| CRH380A | China | 380 km/h |
| Eurostar e320 | UK/EU | 300 km/h |
| Frecciarossa 1000 | Italy | 300 km/h |
| Vande Bharat Express | India | 160 km/h |
| Amtrak Acela | USA | 240 km/h |
| KTX-Sancheon | Korea | 305 km/h |
Use this tool to see if your train actually hits these numbers.
Device Support
- iPhone / iPad
Excellent. Apple's GNSS combines GPS, GLONASS, Galileo, and sensor fusion.
- Android (Qualcomm / Broadcom)
Strong performance. Set location mode to High Accuracy.
- Budget Android
Usable but expect lower refresh rates and occasional jitter.
- Desktop / Laptop
No GPS hardware. Speed will read zero. Use a phone.
Frequently Asked Questions
Does this work underground?+
Why does my speed differ from the timetable?+
Can I use airplane mode?+
Is this legal on high-speed trains?+
Does weather affect accuracy?+
Why does speed read higher near the window?+
Safety
Use this tool as a passenger only. Set up before the train departs. Do not interact with your phone while boarding, alighting, or moving between carriages.
Technical Notes
- •Requires minimum 1 Hz GNSS update rate
- •Accuracy improves significantly above 60 km/h
- •Distance calculated using Haversine formula
- •Speed smoothed via rolling average filter
- •Constellation support varies (GPS / GLONASS / Galileo / BeiDou)