Rob,
I use O27 track and have several of the O27 remote tracks. One warning about the milk car, which I have 2 of: the doors hit the platform of the 'catcher' piece, assuming you will be using one. I had to put a thin (can't remember, wood, plastic, whatever, not metal though) under the track to allow for the doors to swing open.
I assume you will have the same issue.
- walt