Here are a little suggestion, which are not game changing but worth the attention

-Show how many vehicles are currently running on line, in the line window

-Sell all button in depot window

-Directly place one way signals by pressing ctrl, or being able to cycle between signals

-In replace windows for road vehicles, automatically choose the correct cargo based on what current vehicles are refitted to.

And a little more suggestions which are a little bigger but yet smaller

-Rotating stations does not show all the possible placements or angle at which stations are placed, even though it is possible to place stations at other angles

Thanks

Best Regards
Tom