They use their own brand of EZ Mate Couplers. Having said that, my grandson and I have broken 3 of them since Christmas. Not impressed at all with them. I'm checking into the Kaydee brand coupler. Also these couplers need a train magnet of some sort that fits in the track for them to work. Kaydee does as well. Why Bachmann doesn't tell you that and include one in their sets is beyond me. It makes our experience with them not as good as it might have been.