PKP class MBxd1
Polish diesel railcar
The 1Mw is a type of bidirectional, four-axle narrow-gauge diesel railcar produced by Konstal between 1960 and 1966. A total of four units were built, designed for operation on tracks with a gauge of 750 mm (29.5 in). On the Polish State Railways, these railcars were initially designated Mx-201 to 204 under the narrow-gauge rolling stock classification, later renumbered to MBxd1-201 to 204.
History
In the 1950s, the Central Administration of Commuter Railways initiated efforts to replace steam-hauled passenger trains with diesel railcars in personal transport services. In 1958, production of such vehicles was commissioned from Konstal, accompanied by technical documentation developed by the Central Design Office of the Rolling Stock Industry in Poznań.
Design
The 1Mw is a bidirectional, four-axle diesel railcar originally powered by a Wola DTK 150 diesel engine with an output of 150 hp (112 kW). It was equipped with a five-speed mechanical transmission manufactured by Jelcz, pneumatically controlled. Power from the gearbox was transmitted via a universal joint to a reversing gear, then to both axles of one of the bogies, resulting in a wheel arrangement of B'2'. The vehicle features a Westinghouse railway air brake system, type XR1.
During major overhauls in the 1980s, the original Wola DTK 150 engines were replaced with more modern and powerful Wola-Henschel 14H6 engines.
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