The speed of a train depends entirely on its category and the infrastructure of the country. Standard commuter or freight trains in the U.S. and U.K. typically run at speeds between 60 and 79 mph. "Higher-speed" rail, such as the Northeast Regional in the U.S. or standard InterCity trains in Europe, usually cruises at 110 to 125 mph. The true "High-Speed Rail" (HSR) category begins at 155 mph (250 km/h). In 2026, the world's fastest commercial trains, such as China's Fuxing Hao or Japan's Shinkansen, regularly operate at speeds between 186 and 217 mph (300-350 km/h). France's TGV and Italy's Frecciarossa also fall into this elite bracket. In the U.S., the Acela is currently the fastest, reaching 150 mph on limited stretches. Factors like track curvature, the presence of level crossings, and the age of the signaling system act as "speed limiters"; for example, many U.S. tracks are limited to 79 mph by federal law because they lack the "Positive Train Control" (PTC) systems required for higher velocities.