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Nicknamed the "flying bricks", a 3-car set was built as a demonstration train, formed of two power cars and a centre trailer, although it could also be operated as a one or two car train,
The bodies were built by Park Royal, and the underframe and mechanics by AEC. Initially they were numbered Cars 1-3, but later given the BR numbers M79740-2. They were trialed in many places around the country, leading to them being bought by the LMR in January 1955 and a further set and spare power/trailer car delivered in 1955 and another 3-car in 1957. The later eight cars (M79743-50) didn't have the bodysides skirts, and had sliding lights rather than droplights on the sides
This is the trailer coach from production series