Under the sales name “Ferrum 47”, Polish manufacturer Fablok started to offer an industrial locomotive in 1947. Based on the pre-war model T2A, it had the wheel arrangement 0-6-0T and its center axle had lateral play to allow running through curves with a radius of 70 meters. To save maintenance costs, it was operated with saturated steam. Although it wasn't delivered to the PKP, it got the official designation TKh49-1.

The Ferrum 47 and the slightly modified variant Ferrum 724 didn't only find customers in Poland, but also in China, Romania and Hungary. A total of around 480 were built up to 1961. With their output of 400 hp and a top speed of 40 km/h, they did their job fairly well and could still be found on some industrial tracks in the nineties. Today, more than 20 locomotives are still existing in various countries with most of them being in Poland. One is still being preserved operational in Poland, others in Britain.