the bridge takes you to a path that looks like it leads to a train station
He meant the southmost bridge on the east end. The mount is probably a barrier. There is a path above it that has a bridge. There seems to be a slope so, maybe there's a ledge there and that's a shortcut (going from North to South that is).
so did I...
R.I.P. Richard Pryor,The greatest. President of the Red Ghost Motorcycle Club (GTA)