 Metro Cammell received the order for the next batch of thirteen locomotives, which were numbered L20 to L32.The first one was delivered on 8 December 1964 to Ruislip Depot.They were part of a programme to phase out the last remaining steam engines, but the Victoria line was also being built at this time, and some of the battery locos were fitted with automatic train operation (ATO) equipment, to enable them to work on that line.