I already sold an engine a year ago that had the same problem, same locations, a Lionel TMCC Y6B. My 2 Legacy Y6B's have no issues in these locations.
I believe it's the high speed switches. I have 2 Ross switches I purchased 2 years ago for this location. I think my intention was was to match the space as close as possible. I think they are the 11 degree turnouts. I don't believe they will drop right in without a little fuss.
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