From N Gauge wiki
Multiple units (MU) are self-propelled train carriages capable of coupling with other units of the same or similar type and still being controlled from one driving cab. Often these are passenger train-sets consisting of more than one carriage. Single self-propelling carriages (also called railcars, rail motor coaches or railbuses) are multiple units if they are capable of operating with other units.
Multiple units are classified by their power source and are of two main types: Electric Multiple Unit (EMU) or Diesel Multiple Unit (DMU). Diesel-powered units may be further classified by their transmission type: Diesel-Electric (DEMU), diesel-mechanical (DMMU) or diesel-hydraulic (DHMU).
Locomotives utilising multiple-unit train control are not multiple units.
N Gauge Models Available
Various models - To be included soon.