About a narrow gauge steam engine of which more units were built than any other narrow gauge engine in the world – the Kp4.
The picture at the right shows a model of the Kp4 at the Warsaw Train Museum.
This engine was needed by the Soviet Union to rebuild after the Second World War.
It was produced in Poland, Finland, Czechoslovakia, Hungary and the USSR.
The largest number were produced in Poland. Of the nearly 800 built by the Fablok factory in Poland, all but about 14 were exported.
Of those that stayed in Poland, 6 were used in the forest industry at Cisna. The others at industrial sites.
You can see Kp4 units at the Sochaczew train museum. Sochaczew