Armoured trains
https://www.rbth.com/economics/2014/06/03/the_armoured_trains_that_turned_the_tide_of_the_russian_civil_war_35699
Armoured trains
https://www.rbth.com/economics/2014/06/03/the_armoured_trains_that_turned_the_tide_of_the_russian_civil_war_35699
yeah.
Though, I'd imagine that being able to roll artillery along rail lines might make sense if you were needing to lay seige to a city on the way... shrugs