Issue description
if your belts are above the concrete pad of the rail crossing, the navigation overlay will show green, but you will not be able to navigate across the rail crossing. Note that the rail crossing is directional.
This problem is that the belts are above the concrete pad for the crossing, this interferes with crossing, and is not reported on the navigation overlay.
Reproduction steps
Navigation overlay shows you CAN cross the crossing, but won't actually let you cross it. Something also looks really strange about the overlay view too, like the belt shouldn't be blocking that area 2 tiles out.

cutting the belt like so fixes the problem.

After removing segments that are above the concrete pad:

Game version and build number
v0.8.5 b598
Operating system
Windows