I want say you have awesome train game but there something missing. I feel what is missing is let the players to able make own routes. Personal I think would make it the best train game in the world.
There is a PC Editor and if you check the forum it has a whole sub devoted to it. However make no mistake, it is in no way comparable to the editors we had/have in MSTS, Trainz and TSC. It is a highly complex app that really requires a working knowledge of UE processes and conventions to get to grips with it. Also extremely buggy and there is still on official process to cook and release any route you might make without involving DTG. The chances of DTG modifying it for easier use or wider means of distributing finished content, such as freeware, seem slim.