Because most of my new talking train characters are American and Canadian engines, instead of having the hook and chain coupler, they have a different coupling device that's called the Janney coupler. And the way it works, is when the trains come close enough together, their Janney couplers lock together automatically. And it keeps them from coming apart, but there's enough flexibility in there that when go around curves and things, it can move. The following photos are clear examples of the American Janney couplers.