Let people make servers like in Minecraft to have services happening live with people driving them by themself. Also, let them make custom routes.
Multiplayer was scrapped a long time ago along with the official editor. Dtg have said they want to focus on single player, making it playable and stuff. Multiplayer would be a huge task and single player still has a lot of bugs and issues that wouldn't really be pleasant in multiplayer lol. Also, bad stuff might happen in multiplayer where children fool around and give people a hard time. Single player already takes up lots of resources and time, so making multiplayer would probably not be easy for dovetail.
DTG's multiplayer game may take more time, now DTG is more focused on single player mode, here I want to mention a new game (simrail), please forgive me for releasing other games, simrail game has multiplayer mode. Of course, simrail has not yet officially launched. The specific multiplayer online game will not be known until after the official release. Of course, I also hope that DTG has the vision of multiplayer games.