Well I am watching a BN GP20 on eBay that is labeled as a Athearn SD9 but I PM'd the guy and he said it is actually the loco in the photo which is a Proto 2000 GP20 from what it appears. The model has horn hook couplers though which makes me think its a older model. Question is, how much difference is their in the older and newer models? I really want some high hood BN models for my layout as they were some of the main power on the era and protype Im modeling. Most were actually GP9's but I have yet to find a good model of a BN GP9 Im thinking about jumping on this though because bidding is only at $10 with less then a day left. I think alot of people see the title and think its a old Athearn SD9. Should I jump on it and how much is it worth? Thanks guys.