This is the train that started it all for me, but what could it be?

[Triplex]

I don't know if Kiddieland still has it running, but they had the 14" guage live steam engine too. That was an awesome replica of a NYC Hudson with some liberties taken with the colors.

Take a look at the picture above - it's not a Hudson. I can't see the pilot wheels clearly, but it's a Dreyfuss-styled Berkshire or Niagara!