O Stock, which was built as part of the 1935-40 New Works Programme for Hammersmith and City line (when it was still a part of the Met), using metadyne control equipment with regenerative braking, but the trains were made up entirely of motor cars and this caused technical problems with the traction supply so trailer cars were added. (previous | next | back to album | 2020:02:12 14:56:03 | 35% of an album)