I have an Athearn Alco PA unit, HO guage, done in the Santa Fe warbonnet paint scheme. I got it for Christmas in 1970. It has remained in a glass case for 34 years and has not been ran. Would it be a collectable of any worth or just an old friend from my childhood. I would never want to part with it, I've had it for so long but I am curious.....thanks for any comments!