A mixed train or mixed consist is a train that contains both passenger and freight cars or wagons. Although common in the early days of railways, by the 20th century they were largely confined to branch lines with little traffic. Typically, service was slower, because mixed trains usually involved the shunting (switching) of rolling stock at stops along the way. However, some earlier passenger expresses, which also hauled time-sensitive freight in covered goods wagons (boxcars), would now be termed mixed trains. Generally, toward the end of the mixed train era, shunting at intermediate stops had significantly diminished. Most railway passenger and freight services are now administered separately.

A train is a series of connected vehicles that run along a railway track and transport people or freight. Trains are typically pulled or pushed by locomotives or railcars, though some are self-propelled, such as multiple units. Passengers and cargo are carried in railroad cars, also known as wagons. Trains are designed to a certain gauge, or distance between rails. Most trains operate on steel tracks with steel wheels, the low friction of which makes them more efficient than other forms of transport.