This is an interactive combination road and rail bridge in the Zeebrugge Harbor in Belgium.
This is is designed to be triggered to open the span and stop automotive traffic when some form of water traffic
which has been set up as a locomotive comes within the trigger radius on the 2 invisible tracks in the water.
The blue invisible tracks are at ground level (z axis = 0 ft 0.0 in).
The green invisible tracks are at z axis = -10 meters (-32 ft 9.0 in) below ground level.
Water level should be set at -3 meters (-9 ft 10 in) below ground level.
While this has track across the bridge it is fake - just parts in Gmax to look like rails. It is possible to have
this bridge also carry trains (trams on the real bridge on meter gauge track) but it must be done separately from
the mesh. Normally trains cross interactive bridges on invisible track but if that was done with this bridge the
tram would also trigger the bridge to open. Instead run invisible track across it in Surveyor. When this opens it
should stop automotive traffic (like a mocrossing) but it will not stop the train. There is a method of doing that
but I don't remember how its done.