The MP15 should be the easiest to get running well. Traction tires are cheap and it probably just needs a clean and lube. I have a few of the MP15's and the K-Line Alco's. If maintained properly, they will last a long time and perform quite well. The growl at slow speed is normal. Check out Brasseur's for the traction tires. Brasseur's/The Train Doctor K-Line parts page. K2100-X004 for traction tires, $1.50 each.
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