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| Tatra T4 | |
|---|---|
 Tatra T4R on line 44 in Bucharest, 16 August 2019 | |
| Manufacturer | ČKD Tatra |
| Assembly |  Prague |
| Family name | Tatra |
| Constructed | 1968–1987 |
| Number built | 2635 |
| Successor | Tatra T6A2 |
| Capacity | 117 |
| Specifications | |
| Car length | 14,000 mm (45 ft 11+1⁄8 in) |
| Width | 2,200 mm (7 ft 2+5⁄8 in) |
| Height | 3,063 mm (10 ft 5⁄8 in) |
| Doors | 3 |
| Maximum speed | 65 km/h (40 mph) |
| Engine type | TE 022 B |
| Traction motors | 4 |
| Power output | 4×43 |
| Electric system(s) | 600 / 750 V DC |
| Current collector(s) | pantograph |
| Wheels driven | 4 |
| Bogies | 2 |
| Coupling system | Albert |
| Track gauge | 1,000 mm (3 ft 3+3⁄8 in) 1,067 mm (3 ft 6 in) 1,435 mm (4 ft 8+1⁄2 in) 1,450 mm (4 ft 9+3⁄32 in) 1,458 mm (4 ft 9+13⁄32 in) 1,524 mm (5 ft) |
T4 is the name of a tram produced by ČKD Tatra. It is the narrower variant of the Tatra T3 model. A large number of cars was supplied to the GDR, the USSR, Romania and the former Yugoslavia using names T4D, T4SU, T4R and T4YU, respectively. The T4 was originally developed in 1968 and has been continuously modernized or copied since.