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My GP38s ran fine, although they didn't get much use, as they just didn't seem to fit my Montana line. The Atlas-Kato RS3s, after being wired together in pairs, ran almost as well as the MiniTrix Fs, so became the common local power. To be fair, the Fs were in a 4-unit set, so had twice as many wheels as the pair of RS3s. Oddly, I didn't find that the GP38s were that great a puller. Good, yes, but my kitbashed Nn3 boxcab, on a MT Z F-unit chassis, could outpull one! Maybe it's the smaller wheels, or different wheel material, but it certainly couldn't be the weight, as the GP definitely weighed more. I tried it the old-fashioned way, put both on 3-rail track, wire a power pack to each single-gauge rail, with the common rail also common electrically, and run them in opposite directions. To make sure the test was fair, I then switched packs, so each unit ran on both packs.
Is that Lima in the next-to-last picture an FP45 B unit, or is it just packed oddly?
Any of the Mehanotehnika derived Atlas locomotives can be made to run decently with some work. They can be very smooth and quiet with excellent slow speed performance.Doug