A friend asked me how I deal with locos that don't want to play nice, what I do to make them play nice. Since pretty much all of us who do HOn30 for our Maine Two Footers are using either conversions that are based on N Scale loco chassis, or vintage brass kits that are 20 to 40 years old, this might help others, so I'll post what I told him here. This is for old locos in general, so it applies to other scales as well. I won't go into detail on rebuilding brass locos, which is another whole story. First thing I do if a loco isn't running is take a 9 volt battery, with a couple of wires attached, and touch the wires directly to the positive and ground to see if the motor itself will run. If it doesn't, then I spray it with electronics cleaner, a good healthy sopping dose, let it dry, then put just a touch of oil to the bearings at both ends of the motor shaft. I touch the wires to the motor again, and usually, it spins great. If the motor still doesn't spin, then it was probably burnt up by the previous owner and isn't worth trying to rebuild. If the motor spins with the 9 volt battery, then you put it on the tracks but it still won't run, spray the whole running gear, gearbox, everything that moves, with the electronics cleaner, and very lightly oil every moving part, gears, axles, rivets, etc., make sure all the wires are properly soldered, and clean the drivers with a bright boy or pencil eraser. Try running it again. If it still doesn't want to run, then the drivers probably aren't quartered properly. Re-quarter the drivers, and make sure there are no bent rods or linkages. If it still doesn't run right, then there has to be an electrical short somewhere. Look for anywhere that could be causing the short, a wire or part of the loco anywhere that could be causing the positive current from the drivers and other wheels on the positive side of the track to be touching something that is making it flow directly to the negative drivers and wheels on the other side of the loco, instead of to the positive side of the motor like it should be. Unless the motor is ruined, these steps will make it run again. Once it is running, put it on a loop track and just let it run for a few hours in forward direction, then reverse it and run it a few hours in reverse. This will recondition all the moving parts and clean up the electrical brushes and contacts to break the loco back in. If the loco limps or stutters, then make sure you don't have a cracked gear, as the plastic or nylon gears used in most locos sometimes split on the axle. All my locos are second hand, and every loco has needed to be cleaned up, oiled, and usually needs some adjustments and to be broken back in to get it running right. I've only had one docksider loco so far that turned out to be a throwaway. I hope this helps anyone having the same troubles I've worked my way through. Happy Rails!