| 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 |
|
| 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 |
|
| 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.