Do you enjoy any /n/ games, like city builders and tycoons?
>picrel OpenTTD, the best transportation game
If not a game, what software would you use to make model junctions and rail systems? /diy/ has solidworks, autocad, etc. Unironically a dumb game like OpenTTD seems to be the best option for exercising what you learn in your hobby, at least for free (so, not including real model railways.) It's also just fun as fuck.