81-720/721
| 81-720/721 | |
|---|---|
| In service | 10 June 1998-2 August 2019 |
| Manufacturer | Metrovagonmash |
| Built at | Metrovagonmash |
| Family name | 81-720 series |
| Replaced | 81-717 series |
| Constructed | 1991-2004 |
| Entered service | 1998 |
| Refurbished | 2013 |
| Scrapped | 2018–2019 |
| Number built | 91 (cars) |
| Number in service | Not in use |
| Predecessor | 81-717 series |
| Successor | 81-740 series |
| Formation | 2 to 8 cars |
| Capacity | 330/350 passengers |
| Operator | Moskovsky Metropoliten |
| Specifications | |
| Car body construction | Aluminium |
| Train length | 155 meters (in 8 wagons version) |
| Car length | 20 m (65 ft 7+3⁄8 in)/19.21 m (63 ft 1⁄4 in) |
| Width | 2.7 m (8 ft 10+1⁄4 in) |
| Height | 3.644 m (11 ft 11+1⁄2 in) |
| Doors | 8 |
| Maximum speed | 100 km/h (62 mph) |
| Weight | 34.5 t (34.0 long tons; 38.0 short tons)/33 t (32 long tons; 36 short tons) |
| Power output | 660 kW (890 hp) |
| Acceleration | 1.3 m/s2 (4.3 ft/s2) |
| Deceleration | 1.3 m/s2 (4.3 ft/s2) |
| Safety systems | SKIF (СКИФ), ALS-ARS (АЛС-АРС) |
| Track gauge | 1,520 mm (4 ft 11+27⁄32 in) Russian gauge |
81-720/721 (Yauza, alternatively spelled as Jauza, Russian: Яуза), is a subway car model used by the Moscow Metro. The origins of the design go back to 1987, and the first train was built in 1990–1991. Production of "Yauza" was discontinued in 2002 due to ongoing reliability issues. Now «Yauza» is not in use cause of many problems with braking and ALS-ARS systems (Automatic Train Signalization with Automatic Speed Control)