Just wanna chime in with some of my personal ideas.
I really like the way simrail is headed. Still think there is much room for improvement.
First of all:
Unifiy the trains' functions. Example: If one train has working windshield wiper fluid, give it to all trains in the game.
Traxx: One of the displays is white/black, the other one is black/white. Would love to see it if it was possible to switch the displays between black/white and white/black on our own. Maybe also be able to regulate the brightness ourselves. - Same goes for other trains.
When driving I have noticed that the PZB awareness and the general awareness button are interlinked. Why? I feel that with the first German route this could become problematic.
I'd also love to see the instrument lighting function in the Traxx. Right now the button has no use as far as I can see. In reality it deactivates/activates the lighting of the trains' headlamps and also the interior's gauge lights. (Perfect to greet other train drivers by switching it on and off and making the train blink so to say).
I really start to love the game, but I'd also love to see more consistency between the trains on their functionality. (If one train can do XY why can't the other train do it too, if both trains have function XY in reality...