WLs75

The WLs75 is a small narrow gauge diesel locomotive built in Poland, at the ZNTK in Poznań. It was used mostly on industrial railways.

History
The locomotive's design was started at the CBKPTK (Central Design Bureau of Railway Stock Industry) in Poznań. The design was finally made in 1961 by the ZNTK Poznań (Railway Stock Repair Works). It was powered by 75 hp diesel engine and had a mechanical transmission, driving two axles by cranks and connecting rods.

WLs75s were first built in 1965. (WLs stood for Wąskotorowa - narrow-gauge, lokomotywa - locomotive, spalinowa - internal combustion engine). In total, 86 were built with the last shipped in 1975. They were built for and  gauge. Two locomotives were made for for a park railway in Silesian Park.

The locomotives were only used in Poland. It was hoped thatthey would be acquired by Polish State Railways (PKP), but the railways found them under-powered. As a result, they were manufactured for the industry, mostly sugar works, smelters and steelworks. Two were used by the Polish Army. Production was relatively low, because most buyers preferred the cheaper 50 hp 2WLs50 locomotives.