This train is based on the real thing in WWII. A smaller armored train of German in WWII. Beside AA turret like this one, there were also infantry(with MGs) or anti tank turrent(with AT gun). Let's see the scene!
the resistance force used Molotov cocktail
the AA armored train is blocked by rubble
bird's eye view
MG-42 machine gun, exhausted pipe, air intake...etc
2cm Flakvierling 38(AA gun)
remove the AA gun turret
German reinforcement with Panzerfaust(German anti-tank weapon)