Since this is a blog that has a railroading theme to it, I'd thought I'd mention some notable locomotives in the U.S. Not all are listed here.

SP 4449: The only surviving GS-4 steam locomotive, pulled the American Freedom Train. Operational, Portland, OR. 4-8-4

SP&S 700: The only surviving E-1 class Steam locomotive. Operational, Portland, OR. 4-8-4

Pere Marquette 1225: The basis for the locomotive in The Polar Express. Operational, Owosso, MI. 2-8-4. (Did I spell that right?)

SP 4294: The only surviving Cab Forward locomotive. Unoperational, Sacramento, CA. 4-8-8-2.

UP 844: The only steam locomotive never retired by a Class I Railroad. Operational, Cheyenne, WY. 4-8-4

UP 3985: Largest operational Steam locomotive in the world. Operational, Cheyenne, WY. 4-6-6-4.

Milwaukee Road 261: Known for its size and range of operation. Operational, St. Paul, MN. 4-8-4.

N&W 611: The only surviving J class locomotive. Once operational, now display, Virginia. 4-8-4 (sure are a lot of those)

Other locomotives of note are Nickel Plate 765, 2-8-4 (Op.) SP 4460 (GS-6 4-8-4, Unop) Santa Fe 3751 (4-8-4, Op), various 4-8-8-4 and 4-6-6-4 unoperational locomotives and various smaller steam locomotives. One such engine undergoing restoration is Oregon Railway & Navigation 197, a 4-6-2 in Portland, OR.