The Danuta was built in Poznań in 1919. In August 1920 the train participated in the Battle for Warsaw, as part of the Polish 1st Army. In 1924 Danuta was assigned to the armoured train training unit located in Jabłonna, Legionowo County. Like most other Polish armoured trains, Danuta was modernised in the early 1930s by receiving a Ti3 type locomotive, additional guns and AA machine guns.
After the Polish Army was mobilised in 1939, the train was assigned to the Poznań Army. In the first days of the war, Danuta supported various Polish infantry units. On 4 September the train was bombed by the Luftwaffe, but received only minor damage. Next the train participated in the battle of the Bzura. On 16 September the train helped to halt the advance of the German 24. Division and tried to withdraw towards the Polish 16. Infantry Division, but was ambushed by the German anti--tank artillery. The damage received in the ambush and the fact that the train's ammunition supplies were almost depleted forced the commander of the train, Cpt. Korobowicz, to order the train to be blown up together with the assaulting German infantry to prevent German capture. Out of the tanks used to scout on and off the rails, five tankettesTKS were evacuated successfully and two FT-17 tanks blown up.