The SM25 (factory designation 9D350) is a Polish series of

diesel Diesel may refer to: * Diesel engine, an internal combustion engine where ignition is caused by compression * Diesel fuel, a liquid fuel used in diesel engines * Diesel locomotive, a railway locomotive in which the prime mover is a diesel engin ...

shunter used by

PKP PKP may stand for: Organizations * Partido Komunista ng Pilipinas-1930, original Filipino communist party * Partido Komunista ng Pilipinas, underground Filipino Maoist party * Phi Kappa Phi, oldest all-discipline honor society in the United Stat ...

History

Plans for a locomotive with Voith hydraulic transmission (the first of its kind in Poland) were drawn up between the years of 1959 and 1960, alongside the design for the SN80 DMU — though the latter did not make use of the Voith system. The new locomotives were intended to replace the obsolete SM30 series — however, the SM30 was still being built long after production of the SM25 had ceased. Manufacture of the SM25 began in 1961 and came to an end in 1963. During these years only three units rolled off the Fablok production line in Chrzanów, due to the severe difficulty in importing the hydraulic transmission units from Voith. The three that were built were sent to the depot in Kraków where they remained in service until the late-1970s when they were sold to industry. One example — SM25-002 (serial number 5427), built in 1962 — has been preserved as an exhibit at the

Warsaw Railway Museum The Stacja Muzeum is located at the former Warsaw Główna PKP railway terminus and is very close to the Warszawa Ochota railway station. The museum's exhibits are divided into permanent and temporary collections — the latter being displaye ...

Technical data

The SM25 is a C locomotive. This means that there are three powered

axle An axle or axletree is a central shaft for a rotating wheel or gear. On wheeled vehicles, the axle may be fixed to the wheels, rotating with them, or fixed to the vehicle, with the wheels rotating around the axle. In the former case, bearing ...

s under the unit. They are not articulated relative to other parts of the locomotive and are driven via hydraulic transmission. The locomotive is powered by a

four-stroke A four-stroke (also four-cycle) engine is an internal combustion (IC) engine in which the piston completes four separate strokes while turning the crankshaft. A stroke refers to the full travel of the piston along the cylinder, in either directio ...

diesel engine. The SM25 had several improvements over previous classes in the SM series. The most notable being the revised positioning of the cab — which had been soundproofed — and platforms, with the intent of providing optimal conditions for shunting.

References

Railway locomotives introduced in 1961 Diesel locomotives of Poland SM25 Fablok locomotives Standard gauge locomotives of Poland Diesel-hydraulic locomotives {{poland-rail-transport-stub

History

Technical data

See also

References