New to N gauge, and problems

I picked up an inexpensive Bachman N gauge trainset so I would have something that fit in my apartment. I’m having problems with one of the cars de-coupling as the train makes it way around my small layout. Any tips for troubleshooting and fixing this problem?

Repost on the model railroad general discussion board.

You may want to check that all couplers are even with one another.[:D]