Ben Dorsey's Swing Bridge

Howdy folks,
I have a question regarding Ben' Dorsey's swing bridge in '19
When I first load the route the bridge animates from closed to open....one time. So I know the animation works
Now, the question is... what triggers it?
There are no directional arrows like a turntable
Nothing appears to trigger it as you approach it.
Any ideas?

Thanks !
Rick

If it's the one I'm looking at it doesn't need a trigger as such as it's kind mocrossing, so works the same as a basic level crossing, train triggers it when approaching.

Thanks for the reply. It is a mocrossing, but doesn't activate by the train, as the last crew will tell you after the Coast Guard pulls them out of the river:hehe:


edit: Found the issue. For whatever reason, after installing the route, the invisible track was not connected. Couldn't see it until I attempted to move the vertex's.
Reconnected the invisible track and all is good...Odd