Okay, so I'm beginning to design a afforable set-up to get started with and I've been pricing out a start-up steam engine and freight cars. I plan on using a Bachmann steam engine and Athearn cars. From what I understand Bachmann engines use EZ couplers while Athearn cars use McHenry scale knuckle spring couplers, so my silly noob question is: Are they compatible? I'm assuming their not, and secondly: Can the Couplers be replaced on the engine or cars? Which coupler is better? Thanks for your patience, the other Evan.