I don't think the trolley barn has to be moved for modest expansion; the type that would just add a single E Ticket ride warehouse south of the Avenger's Campus entry points. The trolley barn was simply placed where it is because at the time (2012) that was the southern perimeter of the park and the easiest and most obvious place to put it.
But if they really want/need to go with a major expansion for that remaining 7+ acres of land in the southeast corner of DCA, they'd likely need to move the trolley barn to the new perimeter of the park. It could go several places.
One place I don't think we've considered is to place the trolley barn on the
north end of its route, behind Buena Vista Street.
There's land there for a facility twice the size of the current barn that could house 3 or 4 trolleys, if they ever wanted to expand the system through the enlarged park. You'd have to move the trash dumpsters though, and I have it on good authority that the break room nearby is a sacred Judge Judy viewing location, so you might get some pushback from old timers.
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