During WWII, there was a Nazi labor camp functioning in the Railway Repair Facilities. Short after the Nazi invasion of the town, the Germans started to round up people on the streets, and the Jews that were caught during such roundups were forced to work in railway facilities. In his “The memory book of Pruszków and Nadarzyn” (“Księga Pamięci Pruszkowa i Nadarzyna”), Menasze Opozdower described the working conditions in the Workshops as follows: “The most difficult work was that in the railway facilities, when one had to load boxes weighed 100 kg with munitions. (…) People toiled from dusk until dawn without any breaks nor food. The weak Jews that worked there had to suffer a lot. (…) After a few weeks, this whole group was completely exhausted. This was the first concentration labor camp for the Pruszków Jews in railway facilities.” With the lapse of time, after the interventions of the workers of the Jewish Council, the roundups were stopped; in exchange for this, the Judenrat undertook to deliver several tens of workers every day.
During the ghetto's dissolution on January 30, 1941, the rooms of the railway workshops were used as a place of concentration of the Jewish population before it was moved to Warsaw. After the deportation from Pruszków, the Nazis left a group of about 180 Jewish workers, who worked in the railway workshops until the September 1941. In his book “The Pruszków Jews. Six decades ended with extermination” (“Pruszkowscy Żydzi. Sześć dekad zamkniętych zagładą”), Marian Skwara wrote that “many of these forced workers did not survive the difficulties, they died from exhaustion or beating”.