PKP class ST44
Soviet diesel-electric locomotive
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ST44 is a Polish class of Soviet standard and russian gauge mainline heavy freight diesel electric locomotives built between 1965 and 1988 for Polish State Railways and between 1977 and 1980 for Broad Gauge Metallurgy Line. Built by Voroshilovgrad Locomotive Works in Luhansk, Soviet Union. The locomotives were numbered 001 to 1113 and 2001 to 2068 for Broad gauge, one locomotive was numbered 1500 featuring better components[1].
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ST44-1240 and ST44-399 with a freight train in Czeremcha | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Most of the ST44 locomotives underwent some modernizations, mostly being Pesa rebuilding in total 108 examples (76 for PKP Cargo, 32 for PKP LHS designated M62Ks[2]), in which added modifications to it, remaining only the body. Newag also rebuilt some of the locomotives, rebuilding in total 37 examples (20 for PCC Intermodal designated 311D, 17 for PKP LHS designated ST40), Rail Polska rebuilt 13 locomotives at ZNTK Oleśnica into electric examples designated 207E, the company also converted 3 examples into M62M locomotives at ZTK Włosienica, adding some modifications and large headlights removed[3]. Fablok as the first locomotive factory in Poland rebuilt 2 locomotives designated ST44-3001 and ST44-3002 for PKP LHS and 4 locomotives for Pol-Miedź Trans[4][5].
ST44 is the most produced M62 locomotive type producing more than the original M62 locomotives used in Soviet Union, it is also the mostly used mainline diesel locomotive series throughout Poland. The locomotive was widely used across Poland mostly on the non-electrified mainlines, except Lower Silesia and Opole Voivodeship as the ST43 locomotives were common around here, being excellent at inclines.
History
Maintaining freight steam locomotives turned out to be costly and inefficient in Polish State Railways and the locomotive manufacturing plants weren't experienced enough for producing a mainline diesel locomotive, the need for freight diesel locomotives resulted from the gradual steam locomotive withdrawal in the 1960s, in which PKP became the motive power shortage, forcing the purchase of 200 TE locomotives from the Soviet Union[6]. M62 locomotive was chosen to be a replacement for Polish railway, it was decided to import a large number of locomotives, which were already imported by the Hungarian State Railways, the decision is said to have been made after Poland had started to import ST43 locomotives from Romania. For political reasons, Soviet Union forced Poland to buy Soviet instead of Romanian locomotives, as it preferred satellite countries not to export their products.[7][unreliable source?]
The first 4 examples were delivered in 1965 and the serial production of these locomotives started in 1967. ST44 replaced heavy freight steam locomotives as they were shorter, cheaper, faster and more efficient[1]. Along with the construction of the broad gauge metallurgy line, PKP ordered 68 ST44 locomotives intended for hauling freight trains from the Soviet Union on the russian gauge LHS railway line, they were delivered between February 1978 and July 1980[1]. In the early 1980s on the wake of political and social unrest, it was terminated by the martial law introduced in December 1981, import of the M62 locomotives was pointed out as a shining example of Poland's economic exploitation by the Soviet Union, considering their enormous need of fuel, which was then rationed for private customers. Despite this the production continued until 1988[6].
Design
ST44 has a Co'Co' wheel arrangement, running on two bogies with three axles on each bogie.