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Brian, given the age of the loco, it wouldn't hurt to take the shell off, clean the commutator and put new brushes in, even though they probably aren't worn much. You could check the tension on the brush springs, and either stretch them a bit or replace them. While the shell is off, a little grease in the gearbox, and oil the bushings on the worm gear shaft, as well as all axle bushings. The sound won't go away completely, but might quiet down a bit.
It is common for those 1990ish Pullmore motors to be noisy. I found that when they wound the field on a lot of these the windings were more to one side than the other. Caused a magnetic problem, but nothing was rubbing. I hand rewound a couple of these and cut the noise a bit but not all the way. The rewind did increase pulling power. Some of these also had bent armature shafts and / or poorly installed armature shaft bearings. Also the larger shell caused an amplification of the motor's sound. If it runs smooth and pulls well, you may have to accept the noise.
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OGR Publishing, Inc., 1310 Eastside Centre Ct, Suite 6, Mountain Home, AR 72653
800-980-OGRR (6477)
www.ogaugerr.com

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