| Tobu 50000 series | |
|---|---|
 A lineup of Tobu Tojo Line 50070/50090/50000 series trains in March 2008 | |
| Manufacturer | Hitachi |
| Built at | Kudamatsu, Yamaguchi Prefecture |
| Family name | Hitachi A-train |
| Constructed | 2004–2011 |
| Entered service | 16 March 2005 |
| Number built | 400 vehicles (40 sets) |
| Number in service | 400 vehicles (40 sets) |
| Formation | 10 cars per trainset |
| Fleet numbers | 51001–09, 51051–68, 51071–77, 51091–96 |
| Operators | Tobu Railway |
| Depots | Shinrinkoen (50000, 50070, 50090 series) Minami-Kurihashi (50000, 50050 series) |
| Lines served | |
| Specifications | |
| Car body construction | Aluminium |
| Car length | 20 m (65 ft 7 in) |
| Width | 2.77 m (9 ft 1 in) (50050 series) 2.8 m (9 ft 2 in)(Other) |
| Doors | 4 pairs per side |
| Maximum speed | 105 km/h (65 mph) (Tobu Tojo Line) 100 km/h (62 mph) (Tobu tracks) 80 km/h (50 mph) (Tokyo Metro lines) 110 km/h (68 mph) (Tokyu lines) |
| Traction system | IGBT–VVVF (Hitachi) |
| Acceleration | 3.3 km/(h⋅s) (2.1 mph/s) |
| Deceleration | 3.5 km/(h⋅s) (2.2 mph/s) (service) 4.5 km/(h⋅s) (2.8 mph/s) (emergency) |
| Electric system(s) | 1,500 V DC Overhead lines |
| Current collector(s) | Pantograph |
| Safety system(s) | Tobu ATS (50050 series), Tokyo Metro CS-ATC (50050 series and 50070 series), Tokyu CS-ATC (50050 series only), Tokyo Metro ATO (50070 series only), T-DATC (excluding 50050 series) |
| Track gauge | 1,067 mm (3 ft 6 in) |
The Tobu 50000 series (東武50000系, Tōbu 50000-kei) is a DC electric multiple unit (EMU) commuter train type operated by the private railway operator Tobu Railway in Japan since March 2005, manufactured by Hitachi to its "A-train" concept. The trains represent the first use of aluminium body cars on Tobu commuter trains. They are also the first Tobu trains to feature bilingual (Japanese and English) automated passenger announcements.