The term multiple unit or MU is used to describe a self-propelling train unit capable of coupling with other units of the same or similar type and still being controlled from one cab. The term is commonly used to denote passenger trainsets that consist of more than one carriage, but single self-propelling carriages, or railcars, can be referred to as multiple units if capable of operating with other units. Multiple units are of three main types: Electric multiple unit (EMU), Diesel multiple unit (DMU), Diesel electric multiple units (DEMU).
Two coupled ICE 3 on the Cologue-Frankfurt high-speed rail line near Montabaur
A sign at a light rail stop in Stuttgart, Germany which includes pictorial information advising passengers whether services will be formed of single or double / twin multiple-unit light rail vehicles.
