2-6-6-2 "Mallet Mogul" Steam Locomotives in the USA

The first Mallet was an 0-6-6-0. Around 1905 the Great Northern Railroad was interested in one but wanted a locomotive that was better suited to main line operation. Baldwin built five "0-6-6-0"s with leading and trailing two-wheel trucks. This configuration suited the GN's curving main line of the Cascades.

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".

Railroads that used 2-6-6-2 "Mallet Mogul" Steam Locomotives in the USA

Railroads that used 2-6-6-2 locomotives in other countries
Data provided by Steve Llanso of Sweat House Media

Surviving Examples of 2-6-6-2 "Mallet Mogul" Steam Locomotives in the USA

No.	Class	F.M. Whyte	Gauge	Railroad Line	Location	Status	Builder Info	Notes
46 (110)		2-6-6-2	4'-8½"	CWR (Weyerhaeuser)	Pacific Southwest Railway Museum, Campo, CA	display	Baldwin #62064, 1937	Appeared in There Goes A Train.
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
108		2-6-6-2T	4'-8½"	Weyerhaeuser	Black Hills Central Railroad, Hill City, SD	operational	Baldwin #59087, 1926	Restoration From Snoqualmie, WA. Restored to operation in March 2020. Debuted in excursion service in June 2020.
110		2-6-6-2T	4'-8½"	Rayonier (Weyerhaeuser)	Black Hills Central Railroad, Hill City, SD	operational	Baldwin #60561, 1928	This locomotive employs a unique, split water tank which is unlike most saddle-tanks that entirely straddle the boiler.
1308	H-6	2-6-6-2	4'-8½"	C&O	C.P. Huntington RR Hist Soc, Huntington, WV	display	Baldwin #74277, 1949	One of only two surviving C&O 2-6-6-2s, the other one being C&O (WMSR) 1309. Placed on the National Register of Historical Places on Jan 31, 2003. Acquired by the Age of Steam Roundhouse, Sugarcreek, OH on Sep 30, 2025. Tender moved to Sugarcreek in 2025.
38		2-6-6-2	4'-8½"	Weyerhaeuser	Modoc Northern Siding, Merrill, OR	dismantled		Operated by Rayonier INC. until 1968, making her the last Baldwin logging mallet to be retired from commercial use. From a lot a mile from Great Western Railroad Museum, McCloud, CA, Fred Kepner collection. Being kept by the Oregon Coast Scenic.
1309	H-6	2-6-6-2	4'-8½"	WM (C&O)	Western MD Scenic Shops, Ridgeley, WV	operational	Baldwin #74278, 1949	Restoration From the B&O Railroad Museum. Last steam locomotive built by Baldwin. Test fired and moved under its own power on December 31, 2020. Debuted in excursion service on December 17, 2021. Taken out of service in 2023. Returned to service in May 2025.
11	110 ton	2-6-6-2	4'-8½"	US Plywood	Northwest Railway Museum, Snoqualmie, WA	display	Baldwin #59701, 1926	Operated from 1974 to 1990.
6		2-6-6-2	4'-8½"	Weyerhaeuser	Northwest Railway Museum, Snoqualmie, WA	display	Baldwin #60412, 1928	Operated from 1969 to 1974.
4		2-6-6-2T	4'-8½"	Clover Valley	Niles Canyon Railway, Sunol, CA	operational	Baldwin #57684, 03/1924	Ran test runs in the summer of 2012.
8		2-6-6-2T	4'-8½"	Rayonier	Roots of Motive Power, Willits, CA	stored	Baldwin #58064, 1924	From Shelton, then Chehalis, WA. Awaiting restoration back to operation.