In 1927 Polish Ministry of Military Affairs ordered a universal narrow gauge tank locomotive for field railways in the First Locomotive Factory in Poland (Fablok), fit for easy conversion to 600 or 750 mm track gauge. It was newly designed in Fablok and designated as W2A type. It was a D () axle arrangement tank locomotive, powered by a simple twin engine, working on a saturated steam, developing 100 hp power output (Dn2t).). Along with it, Tx26 class included W1A type locomotives. After the war the locomotive worked still on Ostrołęka railway. It was usually used with an additional tender. In 1973 it was withdrawn, pending a main repair, but instead, in 1975 it was given to Railway Museum in Warsaw. The locomotive was stored in a bad condition on a side track in Biskupin, and only in 1993 it was given to a museum depot in
Chabówka, where it was reconstructed and placed on exhibition. ==See also==