Hearing a loud, deep rumbling, roaring, or thundering noise from inside a residential clothes dryer during operation that sounds like an approaching train is typically caused by worn-out drum support rollers, a failing rear drum bearing, or a severely warped drum glide. As the heavy metal drum rotates against worn rollers or flat-spotted bearings, severe mechanical vibration echoes through the cabinet. You can troubleshoot noise sources easily by spinning the drum by hand with the power off. You can verify that your corrective action is successful when disassembling the cabinet, replacing worn support rollers and bearing shafts, and reassembling the unit eliminates the train-like roaring noise entirely.
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