Thanks Norton for your insight
Thanks Jonathan for the additional information.
This isn't Ebay so I guess it is OK to say I live in Poughkeepsie, NY, so have to have NY Central trains, that's why I need to get a Hudson of some type. I actually bought a K-Line ESE 15" set but nothing to pull it with. When I started I thought no 15" they are too toy like, but then when I started looking at the price of the 21" sets decided they would do for now! Really like the 18" length best, K-Line skipped that length with the ESE. Again from starring at Athearns as a kid, as you know there cars were modeled on 72' cars so O gage means 18". My criteria is Transition period, because love Streamlined cars but also Main Line Steam. My life was changed in the mid 1990's when I watched Milw 261 roll by pulling 21 private railcars up a grade at 50 mph. Diesel Rail fanning has just never been the same since! The midsize Steam locos most museums use just ain't the same.