Back D78 Stock (Metro de Londres) Catalan London Underground D78 Stock German D78 Stock (métro de Londres) French D78 típusú szerelvény Hungarian ロンドン地下鉄D78形電車 Japanese London Underground type D78 Dutch Material circulante no Metropolitano de Londres D78 Portuguese London Underground D78 Stock SIMPLE
| London Underground D78 Stock | |
|---|---|
 Refurbished D78 Stock train at West Ham in 2014 | |
 The interior of a refurbished D78 Stock car | |
| Stock type | Subsurface |
| In service | 28 January 1980 – 21 April 2017 (London Underground) 1 November 2021 – present on Island Line (as Class 484) |
| Manufacturer | Metro-Cammell |
| Built at | Washwood Heath, England |
| Replaced | O and P Stock R Stock |
| Constructed | 1978–1981 |
| Refurbished | Bombardier (at Derby Litchurch Lane Works) 2004–2008 |
| Number built | 75 sets (450 cars) |
| Successor | S7 Stock |
| Formation | 3 cars per unit, 2 units per train |
| Capacity | 821 per train |
| Lines served | District |
| Specifications | |
| Car length | DM 18.37 m (60 ft 3 in) UNDM/T 18.12 m (59 ft 5 in) |
| Width | 2.85 m (9 ft 4 in) |
| Height | 3.62 m (11 ft 11 in) |
| Doors | Single leaf, four per side |
| Maximum speed | 72 km/h (45 mph) |
| Weight | DM 27.46 tonnes (27.03 long tons; 30.27 short tons) UNDM 26.11 tonnes (25.70 long tons; 28.78 short tons) T 18.40 tonnes (18.11 long tons; 20.28 short tons) |
| Traction system | Pneumatic single camshaft (GEC Traction) |
| Traction motors | LT118 DC motor (Brush Traction) |
| Seating | 280 per train |
The London Underground D78 Stock, commonly referred to as D Stock, was a type of sub-surface rolling stock which operated on the District line of the London Underground, except on the Wimbledon to Edgware Road service. The first units were withdrawn in January 2015 with the last withdrawn on 21 April 2017.