A 2-6-4 is an "Adriatic" type, and not a "Prairie". But regardless of the name, according to Steamlocomotive.com, there were none in North America.
Wikipedia has a short write-up on the type:
http://en.wikipedia.org/wiki/2-6-4
Here's an article and photo of a 2-6-4T in Ireland.
http://www.rpsi-online.org/locomotives/loco4.htm
Based on a quick Google search, it looks like they may have been found (even if not very common) in Europe and maybe Australia. If you want more, try a Google search on "2-6-4 locomotive".
Regards
Ed
2-6-2 prairie: There was a large class (420 units) of modern dual-purpose locomotives built by the Japan National Railways and its predecessor between 1938 and 1947. The C58's were fitted with elesco feedwater heaters, combined sand box/steam dome casings and all-weather cabs - very clean, good-looking design.
2-6-4 tank locos: The JNR had 2 classes, both of which used the same boilers as classes of 2-6-0 tender locos - basically the same 2-6-0's with side tanks and rear bunkers for use on short branch lines. The C11 had moderately high drivers and was usually used for passengers, although I have seen one hauling a mixed train. The C10 was an earlier attempt, and served as a prototype design for the C11. A number of C11's are still in steam, on a couple of tourist railroads.
2-6-2 tank loco: The JNR C12 class shared a boiler and wheel geometry with the C56 class 2-6-0 tender locos - once again, a tender engine modified with side tanks and rear bunker. Low-drivered, used in branchline freight, switching and (in at least one place) helper service.
Chuck (models central Japan in 1964)
The Reading Railroad had a class of 2-6-4 tank locomotives for commuter service out of Philadelphia in the early years of the Twentieth Century. I think there was one older 2-6-6 tank loco as well.
M636C
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