Zounds like gear slippage to moi!.
No, it's not what I would consider 'normal'.
Last I heard our 'Santa Claus sleigh/reindeer' version of this run, it was the usual muted grind-grind-grind-grind gnoise, But that's par for a Lionel excessory, IMHO.
If this was the Snoopy/Red Baron pylon, I would think the 'rat-a-tat-a-tat-a-tat' gnoise would be kinda kool...unless it was the portent of doom.
Whatever.
Money back guarantee???
KD