I'll second chimmike's statement about Micro-trains. Personally there isn't any other way to go. Rapido's are outdated and oversized not to mention look nothing like a real coupler, Accumates in my experience have not been reliable enough, some of the other one's like Unimates are not designed for magnetic uncoupling, and Kato's are really only designed for Kato's and I only keep them on Kato passenger cars but change my locomotives to MTL's. (MTL=Micro-Trains Line)