with the mod "Beautiful Bridge Railway" it´s already possible..to cross the cargo lines....on water.. and it looks awesome together.
(i have made blueprint book [chunk alinged] waterways, just llike the one i use for trains)

keep up that awesome work! ( but maybe with less changes to the boyes... i have to signal the whole celtic cross again......) btw. would it be possible to include the "signal block" helping thingy?

yeah i know about the solution, but i am bothered at how your ships then cross over the bridges in a rather unrealistic manner. i am creating a draw bridge, that can open for ships and close for trains (actually parts of the graphics allready exist in some folder of the current release, if you want to check them out) but have some clipping issues right now. but they will definitly make it into the mod soon.

i would love to include the signal block thingy, but i am really at a loss how (or why they are not there in the first place)