In railway terminology, a consist is used to describe the group of rail vehicles which make up a train.
Types of trains
A train can consist of a combination of a locomotive and attached railroad cars, or a self-propelled multiple unit (or occasionally a single powered coach, called a railcar). Trains can also be hauled by horses, pulled by a cable, or run downhill by gravity.
Special kinds of trains running on corresponding special 'railways' are atmospheric railways, monorails, high-speed railways, maglev, rubber-tired underground, funicular and cog railways.
A passenger train may consist of one or several locomotives, and one or more coaches. Alternatively, a train may consist entirely of passenger carrying coaches, some or all of which are powered as a "multiple unit". In many parts of the world, particularly Japan and Europe, high-speed rail is utilized extensively for passenger travel.
Freight trains comprise wagons or trucks rather than carriages, though some parcel and mail trains (especially Travelling Post Offices) are outwardly more like passenger trains.
In the United Kingdom, a train hauled by two locomotives is said to be "double-headed", but in Canada and the United States, it is quite common for a long freight train to be headed by three, four, or even five locomotives.
Trains can also be mixed, hauling both passengers and freight, see e.g. Transportation in Mauritania. Such mixed trains became rare in many countries, but were commonplace on the first 19th century railroads.
Special trains are also used for track maintenance.
A single uncoupled rail vehicle is not technically a train, but is usually referred to as such for signaling reasons.
Motive power
