An Intercity 125 high-speed train passing through Didcot, England. On the far side of the tracks is a large car park. In the background is a chimney and some cooling towers of the Didcot power station. As its name suggests, this train is capable of reaching 125 miles per hour (200 km/h). In practice, the trains travel slightly slower due to track restrictions. These trains are powered by diesel engines which run generators feeding electric traction motors.