I did have that experience once. The buyer never specified what scale he wanted, and he was sure surprised when an HO scale car showed up, and he was expecting N.Yes, and I should of said that I'm looking for a HO locomotive. I have two already to run in a short consist, but one has a defective decoder, missing a drive gear and never ran too well.
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I plan on using the mechanism of the new locomotive and placing my shell on the loco.
Thanks Terry for bringing up that question.
Greg