I'm not sure. The miniature series varies quite a bit in "scale" based on the prototype. I have a couple at home (where I'm not) that are extremely tiny. I can't remember what type of loc the blue one is, but the other is an N&W 4-8-4: Hallmark Ornament Lionel Train Miniature N&W #1 1999 - eBay (item 130244071122 end time Aug-10-08 19:12:56 PDT) They also made a Polar Express set in the miniature series. Like I said, without looking at them, I can't be sure, but the blue one that have is probably about half-Z. Dan S.