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The TU8G (ТУ8Г) is a Soviet, later Russian diesel locomotive for track gauge 750 mm (2 ft 5+1⁄2 in).

The diesel locomotive TU8G (ТУ8Г) is designed for loading and unloading and also general purpose locomotive for Narrow gauge railways. The TU8G was developed in 1987 - 1988 at the Kambarka Engineering Works to replace the aging locomotive classes TU6D (ТУ6Д). The TU8G was designed to be used on any gauge from 750 mm (2 ft 5+1⁄2 in) – 1,067 mm (3 ft 6 in). The cab is equipped with heat-system, refrigerator, radio-set and air conditioning. TU8G № 0022 - 0027 made on the 1,067 mm (3 ft 6 in) for the Sakhalin Railway.