It wasn't until 1910 that 2-6-6-2s were built with their firebox behind the drivers and supported by the trailing truck which is normally why one would have a trailing truck. Subsequent 2-6-6-2s were built following this design.
The 2-6-6-2 was primarily a low-speed locomotive. This wheel arrangement was also commonly used on the logging railroads in the Western USA. However, the C&O (Chesapeake & Ohio) continued developing the 2-6-6-2. Their versions evolved into very large road locomotives. With their smokebox-mounted air pumps, they looked quite impressive. Fortunately, two of these class H-6 C&O locomotives survive today.
This wheel arrangement was also used by the Southern Pacific in their development of the Cab Forward locomotive. On the SP this wheel arrangement was called a "Mallet Mogul".
|No.||Class||F.M. Whyte||Gauge||Railroad Line||Location||Status||Builder Information||Notes|
|12||2-6-6-2||4'-8½"||SW Forest Ind||Pioneer Historical Museum, 2340 N Ft Valley Rd (US 180), Flagstaff, AZ||display||Baldwin #60870, 1929|
|46 (110)||2-6-6-2||4'-8½"||CWR (Weyerhaeuser)||Pacific Southwest Railway Museum, Campo, CA||display||Baldwin #62064, 1937|
|4||2-6-6-2T||4'-8½"||Clover Valley||Niles Canyon Railway, Sunol, CA||operational||Baldwin #57684, 03/1924||Ran test runs in summer of 2012.|
|1309||H-6||2-6-6-2||4'-8½"||C&O||B&O Railroad Museum, Baltimore, MD||display||Baldwin #74278, 1949||Rumored to be a restoration candidate by the Western Maryland Scenic.|
|38||2-6-6-2||4'-8½"||Weyerhaeuser||Modoc Northern Siding, Merrill, OR||dismantled||from fenced-in lot a mile from Great Western Railroad Museum, McCloud, CA, Fred Kepner collection|
|110||2-6-6-2T||4'-8½"||Rayonier (Weyerhaeuser)||Black Hills Central Railroad, Hill City, SD||operational|
|8||2-6-6-2T||4'-8½"||RLC||Chehalis-Centralia Railroad, Chehalis, WA||display||Baldwin #58064, 1924||from Shelton, WA|
|108||2-6-6-2T||4'-8½"||Weyerhaeuser||Northwest Railway Museum, Snoqualmie, WA||display||Baldwin #59087, 1926|
|6||2-6-6-2||4'-8½"||Weyerhaeuser||Northwest Railway Museum, Snoqualmie, WA||display||Baldwin #60412, 1928|
|11||110t||2-6-6-2||4'-8½"||US Plywood||Northwest Railway Museum, Snoqualmie, WA||restoration||Baldwin #59701, 1926|
|1308||H-6||2-6-6-2||4'-8½"||C&O||C.P. Huntington RR Hist Soc, Huntington, WV||display||Baldwin #74277, 1949||Placed on the National Register of Historical Places on Jan 31, 2003|