Does anyone know if Kadee O scale couplers reliably mate with Lionel, MTH, K-Line, etc... style couplers? If so, which Kadee couplers (#801, #743, etc..)? Thanks.
Ummmmmm.......No. 0 scale Kadees are less than half the size, never seen anyone successful with it. Usually they swap everything out to Kadees. However: I think the smaller #1 gauge coupler is close to Lionel. I have some of those, I'll check later today when I get the shop open.