Metropolitan Cammell

Metropolitan Cammell (also abreviated to Metro-Cammell or Met-Camm) built 796 first generation vehicles for British Railways — 760 DMU vehicles and 36 Blue Pullman vehicles:

• Met-Camm 'Lightweights' (72 vehicles)
• Class 101 (620 vehicles)
• Class 111 (68 vehicles)
• Blue Pullman (36 vehicles)

Of the numerous private contractors that built first generation DMUs, Met-Camm supplied the most vehicles, this was due to their price per vehicle being one of the lowest and their timeframe for delivery being one of the shortest.

The company had two plants in Birmingham, one at Washwood Heath and one at Saltley. The first generation DMUs were built at Saltley, which would close in 1962.

The image shows a hive of activity at Saltley with Class 101 vehicles in various states on construction circa late September 1958.

Online company histories:
Wikipedia
Grace's Guide to British Industrial History

Much of the company archives is with Birmingham City Council Library Archives but the HMRS (Historical Model Railway Society) also holds material.