I was about 7 in 2000, when MTH was pretty much on top of the O gauge world, and TM was still on a roll with their I Love Toy Trains videotapes.
I really must thank both of those since those were the first things that really got me out of my Thomas push toys phase and into O gauge. But back to the point, at that time, TM released part 7, which introduced me to the streamlined steam engines. At that time, MTH RailKing was the only one producing copious different streamlined steamers.
Looking back though, as more manufacturers have produced more scale locomotives, those streamliners still look a lot better in their RailKing size. I'm not even sure why. The Hiawatha, Pennsy Torpedo, and the UP 49er in particular looked better with their heads shrunk. Now, not all of them looked better small as I got more experience, like the Daylight, C&O Yellowbelly or Commodore Vanderbilt, but many more items like the GP9's and F-3's by Lionel appealed to me more in their classic toy sizes, as well as MTH's RailKing 0-8-0's.
Now the question I ask is does anyone feel similar? Any engines you feel look better when they're not scale?