The Riley RM Series was the last automobile

Automobile

An automobile, autocar, motor car or car is a wheeled motor vehicle used for transporting passengers, which also carries its own engine or motor...

 series developed independently by Riley

Riley (automobile)

Riley was a British motorcar and bicycle manufacturer from 1890. The company became part of the Nuffield Organisation in 1938 and was later merged into British Leyland: late in 1969 British Leyland announced their discontinuance of Riley production, although 1969 was a difficult year for the UK...

. RM vehicles were produced from 1945, after the Second World War, through the 1952 merger of the Riley's Nuffield Organisation

Nuffield Organisation

The Nuffield Organisation was a vehicle manufacturing company in the United Kingdom. Named after its founder, William Morris, 1st Viscount Nuffield, it was formed in 1938 as the merger of Nuffield's Morris Motor Company , another of Nuffield's companies the MG Car Company and Riley.Morris Motors...

 with Austin

Austin Motor Company

The Austin Motor Company was a British manufacturer of automobiles. The company was founded in 1905 and merged in 1952 into the British Motor Corporation Ltd. The marque Austin was used until 1987...

 to form BMC

British Motor Corporation

The British Motor Corporation, or commonly known as BMC was a vehicle manufacturer from United Kingdom, formed by the merger of the Austin Motor Company and the Nuffield Organisation in 1952...

. They were originally made in Coventry, but in 1949 production moved to the MG works at Abingdon.

There were three types of RM vehicles produced. The RMA was a large saloon, and was replaced by the RME.