 | This articleneeds additional citations forverification. Please helpimprove this article byadding citations to reliable sources. Unsourced material may be challenged and removed. Find sources: "PKP class SM25" – news ·newspapers ·books ·scholar ·JSTOR(December 2014) (Learn how and when to remove this message) |
| SM25 | |||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
 SM25-002 at theWarsaw Railway Museum. | |||||||||||||||||||||||||||
| |||||||||||||||||||||||||||
| |||||||||||||||||||||||||||
| |||||||||||||||||||||||||||
| |||||||||||||||||||||||||||
TheSM25 (factory designation9D350) is a Polish series ofdieselshunter used byPKP.[1]
Plans for a locomotive withVoithhydraulic transmission (the first of its kind in Poland) were drawn up between the years of 1959 and 1960, alongside the design for the SN80DMU — though the latter did not make use of the Voith system. The new locomotives were intended to replace the obsoleteSM30 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 theFablok production line inChrzanów, due to the severe difficulty in importing the hydraulic transmission units from Voith.
The three that were built were sent to the depot inKraków where they remained in service until the late-1970s when they were sold to industry.[1]
One example — SM25-002 (serial number 5427), built in 1962 — has been preserved as an exhibit at theWarsaw Railway Museum.
The SM25 is aC locomotive. This means that there are three poweredaxles under the unit. They are notarticulated relative to other parts of the locomotive and are driven via hydraulic transmission. The locomotive is powered by afour-strokediesel 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.[2]
 | This diesel locomotive-related article is astub. You can help Wikipedia byexpanding it. |
 | This Polish rail-related article is astub. You can help Wikipedia byexpanding it. |
