Russia starts to use Armoured trains back again
on their supply lines on Ukraine in 2022
here you can see old AA armoured wagon from times of Great patriotic war slight upgraded 25mm AA guns replaced by 23mm. Probably taken from museum. Here photo of this type of wagon from WW2 so they were serial build at that times and as Flak wagons equip many armoured trains. And now they are back in business.
Here best page about soviet WW2 armoured trains with models of wagons and period photos:
http://wio.ru/rr/ww2sov.htm
here interesting videos
https://twitter.com/i/status/1500866495827566594
https://youtu.be/IwN45A8lOXc
https://youtu.be/o1gGOQT7oKM