The Riley RM Series was the last automobile series developed independently by Riley. RM vehicles were produced from 1945, after the Second World War, through the 1952 merger of the Riley's Nuffield Organisation with Austin to form BMC. They were originally made in Coventry, but in 1949 production moved to the MG works at Abingdon. The RM models were marketed as the Riley 1½ Litre and the Riley 2½ Litre.There were three types of RM vehicles produced.