What did you do to your trains today?

Today, I fixed my Spencer's window (after at least half an hour of trying to apply the enamel in the correct shape. Too small of an area for masking tape.), and put it back together after giving up on a motor swap. All is well, except for the fact that I think I may have put the gears back wrong. One of them keeps getting stuck on a metal part that holds another one of the gears in place. It keeps it from free-rolling easily. Turning it on or turning it on its side will slide the gear back into the correct position temporarily.