I'm am REALLY new at this so I hope these aren't stupid questions. 1) I currently have Bachmann EZ track and i wanted to know if ANY no decoder locomotive will run on it, or only Bachmann? At some point I would like to upgrade to an Atlas Locomotive. 2)Can I change the "couplers" on the Bachmann's I have now? They are shaped like a G and connect to each other..... I seem to have problems with them staying together, and then have problems getting them "coupled" in the first place. I am interested in the magnetic version instead. Thanks for any help you can offer!