I have space exploration and cargo ship running in the same game. until i got my first navigation satellite, everything was nice and dandy. ships were travelling under bridges and trains over them. bridges opened and closed as expected. but after the first moon discovery the bridges disappeared after closing, into nothing it seems, expect their shadows stayed. I was quite pleased to see them again when i tried the navigation satellite for the first time on the orbit of the moon.
A strange world we are living it, isn't it?