idea for the trains

[WonderWoman]

I got a idea for the game what about under grown trains? Like how the under grown belts work I like to see a train in the same way.

[Koub]

I guess you mean underground ?
It has been asked many times before, but there is no clue the devs plan to add this to the game (and I don't think it will).
It would remove almost all the interest of rail signaling.

[Hedning1390]

It would make a lot more sense to have a bridge than a tunnel, but like stated I don't see it being implemented.

[mrvn]

Main problem is what to do with trains stuck in the tunnel or people leaving trains while in the tunnel.

[Tekky]

The OP's suggestion has already been suggested in the following threads:

viewtopic.php?f=6&t=46978 Underground Rail
viewtopic.php?f=6&t=44338 Underground rails

[bobingabout]

I kind of like the idea of under grown trains. Little mini trains darting around your railway, sounds cute.