Craig, regarding the problems you are having with your couplers, I recommend that you buy the N scale Coupler Starter Kit that Micro-Trains offers. It is a little pricey, but is something that you really should have if you plan on using, installing and maintaining their couplers. It looks like you need to do some work on the locos that you showed. The couplers on both have problems that need to be fixed. Even if one of them "works" it is still a long way from being in prime operating condition. There should not be any droop when they are installed correctly and the trip pins should be a certain distance above the rails. This kit from Micro-Trains will get you started in the right direction.
"N", the Normal scale!