North Peak Express, Sunday River, ME.
That panel near the rail looks like it can open up, I don't know if that's a thing though...

EDIT : I do think these are for added maze structure, mainly, loading gates, signs, etc. Because Jordan Bowl Express has these, and I think at one time they supported loading gates,
White Peaks Express, Waterville Valley, NH.
The top has a random rail, however at least in the bottom there is an area for the chairs to come off ;
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