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.

The designation OKl27 stands for a passenger (O) tank locomotive (K) with the wheel arrangement 2-6-2 (l), which was designed in 1927. They were the first locomotives designed and built entirely in Poland and a total of 122 were built between 1928 and 1933. In terms of appearance, they were reminiscent of typical German steam locomotives, just when you look at the driver's cab with the bent side walls. They were delivered by H. Ceglielski from Posen.

Thanks to its symmetrical axle arrangement, it was equally suitable for fast driving in both directions, which made it suitable for the use on suburban railways. When it was introduced, it was the heaviest 2-6-2 tank locomotive in Europe and the maximum axle load was around 18 tonnes.

With good coal, the locomotives were able to pull a passenger train weighing 350 tonnes at 80 km/h on level ground, on a gradient of 1.4 percent this was still 60 km/h with 130 tonnes. Although the running characteristics became a bit unsteady from 50 km/h, this hardly disturbed the operation on suburban trains with many stops. After the invasion from the Germans, 120 of the locomotives were operated by the Reichsbahn as class 75¹². After the end of the war still 95 engines remained in Poland, which were used by the PKP in the areas around Warsaw and Katowice. After retirement from passenger train service, some were sold to private railways. Today four pieces are preserved, half of which are set up as monuments and half in museums.

After the Second World War, the PKP had the Pt47 developed as a further development of the pre-war Pt31. The P stood for express train, the t for the wheel arrangement 2-8-2 and the number for the year of development. In the basic dimensions they corresponded to their predecessor. 120 locomotives were built by Fablok and 60 by Cegielski.

The main changes to the boiler were in the firebox. This was now made of steel and had three brick arches to increase the heating area. In addition, the sand box and the steam dome were under a common panel, which additionally dried the sand. The leading axle was still in a Krauss-Helmholtz bogie together with the first driving axle, while the trailing axle was a simple Adams axle.

The tenders were initially taken from the German classes 41 and 44. Later engines received new Polish tenders with a significantly increased coal capacity of 17 tonnes. The water tank initially held 33 cubic meters and was later reduced to 27 cubic meters by installing a mechanical stoker.

The Pt47 could reach 110 km/h, but could not quite keep up with Pacifics when it came to smooth running. But a larger starting tractive effort was available and the top speed could be reached with trains of up to 600 tonnes. Thanks to their power, they were able to stay in service well into the 1980s. From a total of 15 preserved machines, only one is operational today.

The Tkt48 was a 2-8-2T tank locomotive designed for suburban and freight service starting in 1948. It was based on a non-implemented design from Linke-Hofmann of Wrocław. Its German influence could be seen in the shape of the cab and coal bunker, but at the front it had smoke deflectors of typical Polish design. In passenger service, it could haul 515 tonnes at 80 km/h on the level and 155 tonnes at 50 km/h on two percent inclines. In freight service, it could haul 1,050 tonnes at 60 km/h.

In total, Fablok and Cegielski produced 191 for the PKP and 18 for the industry. Six were sold to Albania and used on the country's first standard gauge line. Soon, the PKP mostly used the Tkt48 in the mountains where a tank locomotive was suited thanks to the same top speed when running in both directions. Many were only retired after 1989 when secondary lines in the mountains were closed. Today 14 are preserved with some in operational condition.