TU4 diesel locomotive

The locomotives of the series ТУ4 ( German transcription TU4 ) of the Soviet Railways ( SZD ) are narrow-gauge diesel locomotives.


As the successor to the 1959-1962 series ТУ2М/ТУ2МК built for use on lighter superstructure ТУ4 the series was developed. In 1960, two prototypes built under the series designation ТУГМ4. Even at these the driver's cab was moved to the end of Lokaufbaus. 1961 began the series production of the series ТУ4 at Maschinenfabrik Kambarka ( Камбарский машиностроительный завод ).

The ТУ4 is designed as a four-axle bogie diesel locomotive with hydromechanical transmission. Due to its mass of only 4.25 tonnes, it is particularly suitable for use on peat railways.

By 1972, more than 3210 ТУ4 were built. This led to various modifications. From ТУ4 -1300 the windows partition was adjusted in the side wall of the driver's cab of the 1964 -built powerful series ТУ5 (two narrow windows instead of a wide ). Furthermore, the position of the headlamps was changed.

Due to the - with few exceptions - uniform gauge of 750 mm for the narrow gauge railways of the Soviet Union ТУ4 were built almost exclusively for this track. 1067 mm were only a few ТУ4 for the gauge built. The ТУ4 was not exported.


Design for low load-bearing superstructure conditional use primarily in peat, forest and industrial railways. Few ТУ4 came to the Department of Transportation ( Ministerstwo putej soobschtschenija, MPS) under their tracks.

As successors of the ТУ4 stood from 1972 ТУ6А series available, which later supplanted also a part of the ТУ4 from their applications. Few ТУ4 arrived at Children railways used. The whereabouts of most ТУ4 is unclear, as standing in use in 2007 were only about 60 pieces detectable.


Due to the decentralized maintenance, it was partly to modification in the use of railways. The ТУ4 the Karinskaja Uskokolejnaja Schelesnaja Doroga in Karintorf received automatic couplers.