Railbus "RA1" is a series of rail diesel buses that unified structurally with metrovagon. It is produced by JSC "Metrovagonmash". That is an independent mobile unit for the carriage of passengers at not electrified lines. The term "Motor coach " is considered more correct by the majority of specialists. However RA1 is classified exactly as "railbuses" in the JSC "Metrovagonmash" factory documentation. Designed for the transport of passengers on non-electrified sections of railways and can be used for urban, suburban and interregional communication. One of the main disadvantages of this Railbus is the lack of a toilet.
Railbus have cabins at both ends of the car, and do not require a turn.
At the same time, RA1 can be operated singly and in the system of many units (in pairs with 2-3 sections) both.