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I've noticed some noise problems with my HO Spectrum Dash 8 - only if I run it fast though, at normal freight speeds it's nearly silent. I would try running the loco with the shell off as suggested above, gently resting a finger on the frame for a while - if you feel vibration, and if the noise ceases, there's the cause of the noise. Cures can range from the foam sheet found in Athearn Blue Box packaging to masking tape - I used this on a Model Power N-scale FP7 which has a metal shell and frame, the rattling stopped instantly. If I remember correctly, the DF4B is a diesel? <br /> <br />Spectrum locos do seem to need a decent-length run to bed in components - mine cruised round the test track for the best part of a day before I was happy with it, now it's a valued loco for both switching (slow and quiet), and line work (can haul as much as 2 Athearn Dash 9s). Hope this is of some help!
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