A train is a mode of transportation that runs on tracks and is designed to carry passengers or cargo. It consists of a series of connected vehicles, often powered by a locomotive at the front. Trains can travel long distances and are commonly used for commuting, freight transport, and tourism. Trains operate on a schedule and can vary in speed and size. They are an essential part of many transportation systems around the world, including subways, light rail, and freight trains. The infrastructure for trains includes railroads, stations, and signals to ensure safe travel.