I purchased a Proto 2000 PA1 a couple of years ago. I have just recently taken it out of the box and gave it a test run on my layout. For the first couple of minutes it ran good, but, soon developed a very annoying screech.....almost a squeaking/rubbing sound. I lifted the front truckset off the tracks and ran it with the back set running. It seems OK...then tried the back set off the tracks. The sound was there. What could be the problem? Believe it or not, I don't remember where I bought it. I think it was a train show in Springfield, Mass., so, I am on my own. Anyone have any ideas? Thanks. Al.