Train Ride from Los Angeles to San Francisco

This article is about car count or vehicle length. For the trains with the longest routes, see Longest train services.

Mauritania Railway iron ore train at the station in Nouadhibou.
The length of a train may be measured in number of wagons (for bulk loads such as coal and iron ore) or in metres for general freight. Train lengths and loads on electrified railways, especially lower voltage 3000 V DC and 1500 V DC, are limited by traction power considerations. Drawgear and couplings can be a limiting factor, tied in with curves, gradients and crossing loop lengths.