More compact rail signals that allow for more versatility when building rail networks.
Mods introducing new content into the game.
When placed on a east-west rail, it's very difficult to tell the state of a regular posted rail signal (there are literally only 2 pixels of width).
I suggest making the posts slightly rotated to the camera - it may not be realistic from the train's perspective, but would help the experience. They can also be slightly tilted up.
