Practical guides, technical deep-dives, and speed comparisons — everything about train speed measurement and GPS technology.
Learn how to measure your train speed directly in a browser using GPS — no app download needed. Works on iPhone, Android, and any modern device.
A plain-English explanation of how GPS satellites, Doppler shift, and the Haversine formula combine to give you a real-time speed reading on a moving train.
What factors affect GPS speed accuracy on trains? Tunnels, buildings, sampling rate, and device hardware all play a role. Here is what to expect.
What is the difference between km/h and mph when measuring train speed? How to convert between train speed units — and why the choice of unit matters.
From local commuter lines to high-speed bullet trains — a look at the real speeds of different train types around the world.
Average train speed explained: the difference between time-average and distance-average speed, with practical examples and the formula used by TrainSpeedTest.net.
GPS speed can jump, freeze, or give unexpected readings. Here is why this happens and what TrainSpeedTest.net does to prevent noisy data from reaching the display.
GPS does not work in tunnels. Here is what happens to your speed reading when a train enters a tunnel, and what the alternatives are.