London Underground C69/C77 Stock

The C69 Stock was built to replace CO/CP Stock on the Circle and Hammersmith & City Lines [1]. The C69 Stock was a high density design with 4 pairs of double-doors per side to cope with the heavy demand on the Circle Line. The 212 C69 Stock cars operated in 6-car formations and 35 such formations were formed (there were a couple of spare cars) [2]. In the late 1970s a second batch of 67 cars was built to provide 11 more trains for the Edgware Road-Wimbledon branch of the District Line as the C77 Stock (an extra car was built to replace a C69 car destroyed by an IRA bomb). Although there were technical differences between the C69 and C77s they could operate together and following refurbishments in the early 1990s there were no longer any visual differences.

Information
Number built: 279 cars (6-car sets)
Built: 1969-71, 1977-78
Builder: Metro-Cammell
Engine: 4 Brush LT117 traction motors per motor car (630v DC fourth rail)
Formation: Driving Motor (DM)+Trailer(T)+DM+T+T+DM

The C69 Stock was designed with Automatic Train Operation (ATO) in mind though this was never fitted [3]. They were later converted to One Man Operation (OMO) in the early 1980s and were the first LU stock to do so and do away with guards. When built the C Stock had longitudinal and transverse seating though the later was removed during refurbishment in the early 1990s [4] in common with other LU stock. Windows were also added to the non-driving ends of cars during refurbishment.

After over 40 years service C Stock was replaced by S Stock in 2014. Three cars of C77 Stock have survived scrapping including 5721 at the London Transport Museum and the other 2 at educational establishments.
Car 5606 at Earls Court

Interior of preserved DM 5721

Non-driving end of 5721 showing the windows added during refurbishment

Cab of 5721

[1] John Glover, London Underground (Ian Allan, 1997) p. 56
[2] John Glover, London Underground Rolling Stock in Colour (Ian Allan, 2009) p. 5
[3] Piers Connor, The London Underground Electric Train (Crowood, 2015) p. 160
[4] John Scott Morgan, London Underground in Colour since 1955 (Ian Allan, 2003) p. 17