What Unit Is Train Speed Measured In?
Most of the world uses km/h for train speed. The USA and UK use mph. Engineers use m/s. Here's the complete guide to train speed units.
Train speed is most commonly measured in kilometres per hour (km/h) worldwide. The USA and UK primarily use miles per hour (mph). Railway engineers use metres per second (m/s) for technical calculations. Some countries and maritime-influenced systems also reference knots.
- km/h: Standard unit in most of the world
- mph: Used in USA, UK, and some former British colonies
- m/s: Used in engineering and physics
- knots: Occasionally used in maritime-influenced transport
Most common worldwide
Europe, Asia, Africa, S. America
USA & UK standard
Miles per hour
Engineering & physics
SI unit of speed
km/h per mph
Conversion factor
Speed Units by Country
Different countries use different units for train speed displays and timetables.
km/h countries
Most of the world uses kilometres per hour: Europe (except UK rail), Japan, China, India, Australia, South America, Africa, Southeast Asia, and the Middle East.
mph countries
The United States and United Kingdom measure railway speed in miles per hour. Some former British colonies also use mph.
Engineering use (m/s)
When calculating acceleration, braking distances, and forces, railway engineers convert to metres per second (m/s) — the SI base unit of speed. 1 m/s = 3.6 km/h.
Dual-unit displays
Many modern train cab displays show speed in both the national unit and one alternative. TrainSpeedTest.net lets you switch between km/h, mph, m/s, and knots at any time.
Frequently Asked Questions
Related Train Speed Resources
Test Your Train Speed Now
Open on your phone, grant GPS access, and see your exact train speed instantly. No app required.
Works on iPhone, Android & any modern browser · Always free