Until 1947 the official name was First Factory of Locomotives in Poland Ltd. (Polish: Pierwsza Fabryka Lokomotyw w Polsce Sp.

), Fablok being a widely used syllabic abbreviation of Fabryka Lokomotyw, among others as the company's telegraphic address.

In 1935–1936, Fablok produced five Luxtorpedas (fast railcars) for PKP under the guidance of engineer Klemens Stefan Sielecki.

The idea was to test both engines in parallel to compare top speed, acceleration, coal and water consumption, etc.

Fablok was incorporated into Henschel & Son under the name Erste Lokomotivfabrik in Polen A.G. Chrzanow (1939–1941)[3] and from 1941 as Oberschlesische Lokomotivwerke Krenau.

After Poland was liberated, this documentation proved vital for the reconstruction efforts of the national railway industry, especially the diesel and electric locomotives.

Export markets for its standard-gauge passenger, fast, freight, and industrial steam locomotives were Albania, China, Hungary, India, Korea, Romania, and Vietnam.

Narrow-gauge units were exported to Albania, Bulgaria, China, Romania, the Soviet Union, and Yugoslavia.