Walt,
I read your response to my suggestion. My setup is Gargraves Phantom 3-rail track on Midwest Product cork roadbed, the Lionel Uncouple- Unload O Gauge Track section rests on the upward bend nibs of the unloading platform, special adapter pins from Gargraves connects the Lionel O gauge Uncouple- Unload Track Section. Given this is a different setup then you use, the overall height of the Lionel and Gargraves is basically the same on my application. Both of our unloading platforms seem to be the same, one difference is the Lionel Milk Cars, mine was from the 1955/1956 train set. The four upward bent nibs that support the unloading track from the base of the platform is probably 1/8 inches high. I recommend that if possible remove the unload platform and unload track from your adjacent track, place your unload track on the platform nibs, remove the milk car plastic upper body by removing the end screws, then place the steel lower car body on the unload track, operate the milk man and the metal base he stands on , to check for interference. This may give you a good indication what is going on and how to correct it.
