Team Create Crash Problem

A few dev’s and I were team creating an epic map, me building a train when I tried to csg something then everything froze. Now every-time we try to open the place in edit mode studio crashes. We tried reverting it to an earlier point, nothing is working and it still crashes even worse now that we reverted to an earlier version.

The place in question is this:

Sometimes it takes a while for CSG operations to finish, depending on the complexity of the operation. Are you sure it froze? If so, can you send me the CSG in question, or at least the parts that made it?