I have a set of four Williams O27 passenger cars about a year old. From right out of the box, they have never wanted to roll, and pull HARD.
I've looked at the trucks and I can't see anything wrong. Everything is clean as a whistle. The axles just don't want to turn, even with a drop of light oil on each bearing.
These are fancy metal trucks, and I can't really see how they come apart. Not that I really want to go in there and start sanding/scraping and make things worse.
Short of huffing these cars in the circular file, what else can I try to get them to free up?