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Were can I find replacement handrails for a Proto 2000 GP18? Having a hard time locating any on the web..thanks for any help

You could contact Walthers Customer Support and ask if they have any. I've done this before with great results. I had to get parts for an Proto 2000 E8/9. They didn't charge me for them either. I was shocked. I would recommend trying them first.
John
Yep, always call Walthers first. Ask to speak to a tech and tell them you're looking for handrails. Walthers seems to have a huge pile of older detail parts for P2K locomotives and, if it's available, they'll often ship it out to you at no charge.
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