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Speaking from a manufacturer's point of view, it is unlikely all of these locos are tested as they leave the plant. Thus, it would be difficult to determine the cause of every glitch. However, the manufacturing process may leave burrs and flash which can cause problems. One of the most important aspects of getting a good running loco is break-in. You didn't mention if you had run the loco for a break-in period. I would suggest running both forward and reverse and reverse the direction on the track and run the loco for several hours and see if this improves the operation. You could return for replacement, but don't form any opinions until the loco has been broken-in. The only Spectrum loco I have owned was K-4 Pacific and it ran great. Also, some real steam locomotives had a wobble or sway, as they moved down the tracks.
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