Hi
My initial requirement was the ability to have overground station on invisible bridge to snap asset to track.
This file http://blackwizard.free.fr/eat1963_spitzkehre_util.lua contains few upgrade to add the start of a support for bridge and tunnel.
Few limits anyway:
- not working for the depot: I have not found how to disable terrain alignment under the bumper.
- not obvious to snap to existing track
- if used to store cargo, it could be visible under the bridge table as this is where the lanes are; an additional parameter for lanes z offset could be a way.
Bridge and tunnel type selection could be added but does not seem essential.
Feel free to enhance and share through mod upgrade.