Originally Posted by Amfleet25124:
...without having compare tracks side-by-side in a pile of a couple dozen pieces of track...
I gave up and finally labelled all my track on the bottoms of the ties. The Lionel O-27 42" & 54" with three ties kept getting intermingled, causing geometry issues when setting up the Christmas putz. The K-Line O-27 42' was OK as it has 4 ties.