I looked up the coupler height gauge (Kadee) and they have one that comes with a No 5 coupler and #58 scale coupler, and another insulated multi purpose with the 148 whisker coupler and the 158 scale whisker coupler.... Which one should I get?!?!

I had a similar problem, but basically you need to practice a bit. Make sure the magnet is properly attached to the tracks. In my case, the magnet did not stick properly and came off inadvertedly. Good luck!

So it seems that with EZ Command 3 locos tops. any recommendations for a good value starter power booster (to connect switchers too)?

I followed the instructions for the reset of the EZ command controller and it does work (meaning it resets the locomotive. Unfortunately it did not fix my problem as the locomotive only moved a few inches before it stopped again. I will send it to PA tomorrow for repair or replacement, as it is only 2 days of use old. BTW, as Jerry pointed out, the reprogramming instructions are in the user's manual in full detail.

Thank you all for this helpful information!

I see. Just to wrap it up. If I get a Bachmann with DCC and sound, do I need anything "extra" or it works on my Bachmann EZ Command setup out of the box?

Thanks again! I bought two Athearn cars and soon after, one of my Bachmann DCC locomotives (the one I was using to haul those cars) stopped moving. Jerry suggested to reset the system, something I will try later tonight. Also, the Athearn couplers sit a bit too high relative to the Bachmann's, and slight level changes on the track lead to unintended separation from the locomotive (I was unable to find anything on this through google). Based on your kind help, the athearn cars/Bachmann locomotive mix fiasco described appears to be a bad coincidence). I was debating whether to buy an athearn dcc locomotive, but on the retail websites it is hard to tell wether they are dcc on board or just dcc ready (or plain dc). Is it usual for the engines to be in need of a "reboot"
You probably know by now that El Novato = The Rookie in Spanish 

Is is OK to run an Athearn locomotive on a DCC Bachmann setup? If so, how do I know if an Athearn locomotive is DCC equipped?

Thanks!

That's exactly what I meant, thanks much. Is there a risk of a short?

Can I connect the (square end of the) red power wire to a remote electric switcher and the other end to the DCC controller? Would that make the electric switcher work? Is the DCC controller enable to do that or is there a risk of a short? The DCC controller does have a second slot (in addition to the one that connects it with the rerailer to provide power to the tracks).
Thanks.

Will give it a shot, thanks a lot Jerry!

I have a DC Command controller. How do I do that? Thanks a lot!

I just got an HO Digital Commander set with a GP40 engine and an FT-A engine. The FT-A stopped running after only 2 days of use (some 8 hours of total use; not continuous of course). It responds to light on/off command, but does not move at all. Any suggestions?