| TU7 - TU7A | 
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| Specifications | 
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 Configuration:
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 |  • UIC | B'B' | 
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 | Gauge | 750 mm (2 ft 5+1⁄2 in) to 1,435 mm (4 ft 8+1⁄2 in) | 
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 | Wheel diameter | 600 mm (23.62 in) | 
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 | Minimum curve | 40 m (131.23 ft) | 
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 | Length | 9,400 mm (30 ft 10+1⁄8 in) | 
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 | Width | 2,450 mm (8 ft 1⁄2 in) | 
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 | Height | 3,550 mm (11 ft 7+3⁄4 in) | 
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 | Axle load | 5 t (4.9 long tons; 5.5 short tons) (?) | 
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 | Loco weight | 24 t (24 long tons; 26 short tons) | 
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 | Fuel type | Diesel | 
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 | Prime mover | Bernaul 1D12-400 | 
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 | Engine type | V12 diesel | 
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 | Cylinders | 12 | 
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 | Transmission | hydraulic | 
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| Performance figures | 
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 | Maximum speed | 50 km/h (31 mph) | 
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 | Power output | 400 hp | 
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TU7 (ТУ7) - Soviet, later Russian diesel locomotive for gauge 750 mm (2 ft 5+1⁄2 in) – 1,067 mm (3 ft 6 in).