Gun-train?

[Caia]

So I had a look around for one, no luck.

What I propose is a train locomotive/wagon that has gun turrets (AI and player controlled?) mounted on the side or on the top. With various versions (pretty much like regular turrets), such as ammos and flamethrowers, etc.

For visuals, maybe based off of Land of the Dead's "Dead Reckoning" (but a train instead of a semi truck):

I would have a go myself but I've never used Lua before and I don't want to confuse my C# learning

[Aeternus]

I know that some mods support vehicle equipment - including some weapons and shielding. Those don't get a visual representation though. I tinkered with it in a game with bobs mods and aav, not sure which was responsible for the vehicle equipment grids.

[impetus maximus]

haven't tried it but check out Senpais Trains.
or scan through the trains tags.