major variant of KM6 line from Warszawa Wileńska station to Małkinia, through Wołomin, Tłuszcz (Warszawa – Tłuszcz is the most frequent service)
Before the German occupation, the mega quarry was owned by the Polish industrialist Marian Łopuszyński who built a railway track connecting the mine with Małkinia–Sokołów Podlaski junction.
Even if he could not be shown to have been criminally involved at Hadamar, Hirtreiter did confess to having worked in a camp near the Polish village of Małkinia where Jews were killed in a gas chamber.
The villages are served by a railway stop named after Urle, too; the stop is used only by local trains of Koleje Mazowieckie (previously PKP) that travel between Warsaw and Małkinia (or closer Łochów on the same line).