Thanks for the info.  I have watched eBay and there have been a couple entire sets come up for sale anywhere from $85 to $100. I just need the engine.  I may give the repairman a call and see what he says. Thanks again everyone.

I have an 80s train set bought at a yard sale. It's a Bachmann set called that Flying Scott. It's a really nice looking set but the engine won't run and someone has taken it apart and broken one of the plastic arms attached to the drive wheels. Anyone know where I could get another engine for this set?  Thanks.