Add some beautiful bridge-rails (wood, iron, stone-brick) that can be placed on water, and change default Big-electric-pole and rail-signals to be placeable on water.
Mods introducing new content into the game.
Trains are great, but what if they could do even more?
Your bridge rail diagonal uses gravel base. https://i.imgur.com/XaqHo7t.png
Also the corpse of bridge railways are still using normal rail's corpse.
Are you ever gonna have a railway just ending on water like that though? Seems like a fairly minor issue.