Rolling stock refers to the vehicles that move on a railway track. This includes trains, freight cars, and passenger coaches. Essentially, any vehicle that can be moved by a locomotive or is part of a train system is considered rolling stock. Rolling stock is crucial for the transportation of goods and people. It can be categorized into two main types: freight cars, which carry cargo, and passenger cars, which transport travelers. Proper maintenance and management of rolling stock are essential for ensuring safety and efficiency in railway operations.