Joe,
A couple of pics for your review. Also, there was a good article a while back about Catenary and it showed how the modeler lowered the wire to the level of the entrance to a shed. This pushed down the pantograph so the engine could enter. I can't remember what run it was in. It might have been Run 264 - June/July 2013 and wouldn't you know I can't find that copy in my piles around the house.
Ron
Catenary into NY Penn Station
You can see the catenary go through this covered station.