London Underground 1973 Stock

London Underground 1973 Stock
Refurbished 1973 Stock train at Hillingdon
The interior of a refurbished 1973 Stock car
Stock type	Deep-level tube
In service	19 July 1975 – present
Manufacturer	Metro-Cammell[1]
Built at	Washwood Heath, Birmingham, England[1]
Replaced	1959 Stock
Constructed	1974–1977[1]
Refurbished	Bombardier Prorail (at Horbury railway works) 1996–2001[1]
Number built	175 units (87+1⁄2 trains)
Successor	2024 Stock
Formation	3 cars per unit, 2 units per train
Capacity	684 per train (228 seated)[1]
Depots	Northfields
Lines served	Piccadilly
Specifications
Train length	106.810 m (350 ft 5.1 in)
Car length	DM 17.473 m (57 ft 3.9 in) UNDM/T 17.676 m (57 ft 11.9 in)
Width	2.629 m (8 ft 7.5 in)
Height	2.888 m (9 ft 5.7 in)
Maximum speed	72 km/h (45 mph)
Weight	DM 27.15 long tons (27.59 t; 30.41 short tons) UNDM 26.16 long tons (26.58 t; 29.30 short tons) T 18.16 long tons (18.45 t; 20.34 short tons)
Traction system	Pneumatic single camshaft (GEC Traction)[1]
Traction motors	LT118 DC motor (Brush Traction)[1]
Electric system(s)	Fourth rail, 630 V DC
Current collector(s)	Contact shoe
Track gauge	4 ft 8+1⁄2 in (1,435 mm) standard gauge

The London Underground 1973 Stock is a type of rolling stock used on the Piccadilly line of the London Underground. It was introduced into service in 1975 with the extension of the line to Hatton Cross, followed by a further extension to Heathrow Central in 1977. A total of 86 six-car trains were built.

The trains were built by Metro-Cammell between 1974 and 1977, and were refurbished by Bombardier Transportation between 1996 and 2001. They are some of the oldest trains running on the Underground, and in Britain as a whole, second only to the 1972 Stock running on the Bakerloo line.