Armored trains were surprisingly effective during WW2 https://en.wikipedia.org/wiki/Armoured_trains_of_Poland#1939%E2%80%931945_(WWII) https://en.wikipedia.org/

Armored trains were surprisingly effective during WW2 https://en.wikipedia.org/wiki/Armoured_trains_of_Poland#1939%E2%80%931945_(WWII) https://en.wikipedia.org/wiki/Armoured_trains_of_Poland#1939... "During the Polish September Campaign, Polish armored trains took part in roughly 90 clashes with the German units.[5] They played a significant role in several encounters, most notably, no 53 made an important contribution to the Polish victory in the Battle of Mokra, and no 54 was used very successfully in the defense of Silesia.[5] Armored trains were responsible for destroying or damaging several dozens of armored vehicles, including tanks, shot down or damaged three airplanes, and inflicted numerous infantry casualties.[5] Only two trains (no 11 and 55) were destroyed in direct combat by the German land forces, and only no 13 was destroyed by the German air force.[5] Remaining trains were abandoned and destroyed by their own crews when they ran out of munitions and could no longer retreat.[5] The successful role of the armored trains, considered obsolete by both Polish and German strategists, caused the revision of that judgment by both sides" The most successful one https://en.wikipedia.org/wiki/%C5%9Amia%C5%82y_(armoured_train)#World_War_II https://en.wikipedia.org/wiki/%C5%9Amia%C5%82y_(armoured_tra... fought on both western German front and later in current Ukraine defending Lviv from both Germans and Soviets attacking simultaneously arm in arm.