Will GPS work inside a train?

Usually yes, near a window — GPS needs a view of the sky, and modern trains with large windows generally let enough signal through. Metal-heavy carriages or tunnels can weaken or block the signal temporarily.

Why does speed drop to zero in a tunnel?

GPS signals can't pass through tunnel walls, so your device briefly loses its fix. Speed should resume updating once the train exits the tunnel and regains sky visibility.

Can I see the train's top speed for the journey?

Yes — the stats below the gauge track your max speed, average speed, and distance for the whole trip, not just the current moment.

Train Speedometer

Check your train's live GPS speed from a window seat — current speed, max speed, and distance.

GPS Inactive

km/h

SpeedCheck needs your device's location to measure speed. Your browser will ask for permission when you tap Start Tracking — your location is never stored or sent anywhere.

Max Speed0km/h

Average Speed0km/h

Trip Distance0.00km

Moving Time00:00:00

Do not interact with this device while driving. Have a passenger operate it, or mount it securely and glance only when safe to do so.

Best used near a window

Hold your phone near a window for the clearest GPS signal, start tracking, and watch your live speed update as the train moves. It's a fun way to see exactly how fast you're travelling, and to track the fastest point of your journey.

Expect brief gaps in tunnels or deep cuttings — GPS needs sky visibility, and will pick back up automatically once it's available again.

Other speedometers

Related guides

Frequently asked questions

Will GPS work inside a train?: Usually yes, near a window — GPS needs a view of the sky, and modern trains with large windows generally let enough signal through. Metal-heavy carriages or tunnels can weaken or block the signal temporarily.
Why does speed drop to zero in a tunnel?: GPS signals can't pass through tunnel walls, so your device briefly loses its fix. Speed should resume updating once the train exits the tunnel and regains sky visibility.
Can I see the train's top speed for the journey?: Yes — the stats below the gauge track your max speed, average speed, and distance for the whole trip, not just the current moment.