Weyerhaeuser Timber 2-6-6-2 "Mallet Mogul" Locomotives in the USA (2024)

Class 105 (Locobase 4066)

Data from [Weyerhaeuser Timber 2-6-6-2 "Mallet Mogul" Locomotives in the USA (1)], supplemented by DeGolyer, Vol 80, pp. 216+ and 228+. See Locobase 3643 for a discussion of the split-saddle tank design. Works numbers were 60784-60785 in April 1929 and 61355 in May 1930.

Two Prairie Mallet split-saddle tanks based on the compound tank delivered a year earlier (Locobase 3643), but with four HP cylinders, each receiving steam through an 8" (203 mm) piston valve arranged for 70% maximum cut off.. They were followed immediately by a similar engine with a larger boiler and grate (Locobase 4041), then a year later by a repeat of the design shown here, but with slightly higher adhesion and engine weights.

All were expected to handle 4% grades, 40-degree curves, and 60 lb/yard (30 kg/metre) rail.

All three operated for Weyerhaeuser until the 1950s, after which they were scrapped.

Class 110/1 (Locobase 3643)

Data from Jon Davis's [Weyerhaeuser Timber 2-6-6-2 "Mallet Mogul" Locomotives in the USA (2)], supplemented by DeGolyer, Volume 80, pp. 334+. (Thanks to Chris Hohl for his 27 July 2015 email highlighting data from the DeGolyer specs that Locobase had overlooked.) Works number was 60561 in July 1928.

A Prairie Mallet "semi-saddle"(or split) tank, this engine worked logging lines for years, later joined by a slightly larger, younger sister, for which see Locobase 4054. Like the other Baldwin Mallet tanks, this compound used 8" (203 mm) piston valves on the HP cylinders, 12" (305 mm) on the LPs.

Davis shows that this Prairie Mallet Tank operated for Weyerhaeuser from 1928 to 1954 first from Longview, Wash., then from 1937 out of Vail, Wash. Rayonier, Inc of Railroad Camp, Wash., then ran the locomotive as a tender engine until 1968. After years of storage, enthusiasts at the Black Hills Central began restoring 110 in 1999. Its first revenue run came on 12 May 2001.

[Weyerhaeuser Timber 2-6-6-2 "Mallet Mogul" Locomotives in the USA (3)] has an extended article on the 110's history. Created specifically to serve logging roads, the split-saddle tank Mallet handled the rough track and steep (4-8%) grades as well as a Shay, but was easier to maintain. And so flexible was the layout that 40-deg curves [146 foot/44.5 kg/metre radii] were well within the engine's turning radius. The Baldwin logging engines were a big hit with their crews because they were "clean" engines (oil-fired and superheated), unlike the older engines that threw water, soot and "other gunk" out of the stack.

Class 110/2 (Locobase 4064)

Source of information is an account by William Schneider for the PSMRA presented by the SDRM's website. See also [Weyerhaeuser Timber 2-6-6-2 "Mallet Mogul" Locomotives in the USA (4)] . See also DeGolyer, Volume 80, pp. 340+ and 348+. See Locobase 3643 for a discussion of the split-saddle tank design. (Thanks to Scott Golding for his 13 November 2020 detailing of the tenders Rayonier added to these tank engines.) Works numbers were 62064-62065, 62068 in 1937 (62064 in June).

These unusual locomotives worked the Washington State forest logging lines for years until 1967. As built the Prairie Mallet articulated design featured split saddletanks on the boiler (one over each engine unit), which shortened the engine's wheelbase. The specifications describe the engines as "in general to be duplicates as Clemons Logging Company's Locomotive No 8, Baldwin class 16 30/50 1/4 DD 6 [Locobase 4052], except where otherwise specified and to embody modern Mallet construction."

Eight-inch (203 mm) piston valves admitted steam to the HP cylinders, 12" (305 mm) piston valves served the LPs.

Scott Golding's remarks about the Rayonier tenders are here quoted in full:

"Just a note that Rayonier added tenders to two of these while in our ownership. We didn't remove the saddle tanks, obviously, but wanted additional range on them, so we added tenders from other locomotives that we were scrapping.

C/N 62064, our number 111, got a tender in 1960, from our #18, a 1901 Ten-wheeler, c/n 18734, which we had recently scrapped.

C/N 60561, our number 110, got a tender in 1962, from our #101, a 1912 Mikado, c/n 38966, which we had scrapped in 1959.

We kept the tenders for use as fire cars (forest fire suppression), but at some point decided that we wanted our tank mallets to have better range, and had the tenders sitting around, so we pressed them back into service. Best I can tell, both lokeys kept their tenders when we sold them, though I don't see that the one at Black Hills still has / uses that one. "

After stints with Weyerhaeuser (1937-1946) and Rayonier (1946-1967), Georgia-Pacific bought #110 for the California Western. The CW converted it to a tender engine, removing the distinctive tanks and fuel bunkers in the process. In 1984, runs on the Super Skunk tourist service came to end and CW #40 was donated to the Pacific Southwest Railway Museum Association, later passing on to the San Diego Railroad Museum.

Weyerhaueser converted the 9 to a 2-6-6-2T plus separate tender and renumbered it 8.

Class 111 (Locobase 4041)

Data from [Weyerhaeuser Timber 2-6-6-2 "Mallet Mogul" Locomotives in the USA (5)], supplemented by DeGolyer, Vol 80, pp. 222+ . See Locobase 3643 for a discussion of the split-saddle tank design. (Thanks to Chris Hohl for his 9 May 2015 email catching a ridiculously low adhesion weight because of a dropped zero in the entry.) Works number was 60811 in May 1929.

Weyerhaeuser clearly was sampling different variations of simple and compound-expansion split-saddle-tank articulated locomotives. Baldwin had produced two simple-expansion engines the previous month with boilers that would also appear in two different Mallet-compound tank variants. The 111 was bigger and had an all-simple expansion cylinder setup with each cylinder taking steam through 8" (203 mm) piston valves that were set for a 70% maximum cutoff.

Jon Davis of loggingmallets notes that this burly little split saddle tank ran for Weyerhaeuser until 1947 at three different locations. It then travelled north to Vancouver Island, BC, for Canadian Forest Products, where it operated until 1962. It was then scrapped.

Class 4 (Locobase 3166)

Data from [Weyerhaeuser Timber 2-6-6-2 "Mallet Mogul" Locomotives in the USA (6)] and DeGolyer, Volume 80, pp. 356+. See also "LoggerHogger", a member of a TrainOrders.com forum who posted "Sierra #38 & Rayonier #120 - Weyerhaeuser's Twins!" on 9 January 2009 at 0700 ([Weyerhaeuser Timber 2-6-6-2 "Mallet Mogul" Locomotives in the USA (7)],1844966, last accessed 2 July 2012). Works numbers were 61781 in September 1934 and 61904 in 1936.

Baldwin's specification book Volume 80 describes #4 beginning on page 356 and #120 on page 364.

Clearly, Weyerhaeuser wanted to put as much adhesive weight on 66 1/2 lb/yard (33.25 kg/metre) rail as it could manage. These behemoths didn't delve deeply into the timberlands, instead negotiating curves of a relatively modest 18 degrees (320 foot/97.5 metre radii) and grades that maxed out at 2%. Their HP cylinders took steam through 10" (254 mm) piston valves while the LP cylinders used 12" (305 mm) piston valves.

120, which was ordered a little later (order 16 36/56 1/4 DD 54) is described in the specs as a "duplicate of 16 36/56 1/4 DD 53 except where otherwise specified."

LoggerHogger explains that though both engines were indeed sister engines in WT, they did not work on the same line until the mid-1950s. 4 went to work on the West Side line running out of Klamath Falls, Oregon. Her massive bulk and size didn't suit the track and she suffered several derailments. It was only in 1952, however, that the 4 went to the Sierra Railroad as their 38. Sierra sold the 38 to Rayonier Company in August 1955 where the engine ran until 1967 when it was retired and put on display. 4 has since been moved twice, the second time to Merritt, Ore.

120's first service ran out of Vail, Wash. Later, WT's Chehalis Western used her to take logs to the Milwaukee Road junction. 120's reunion with 4 came in 1954 when Rayonier bought the former engine. Its career came to a premature end in 1962 when the crown sheet failed after the boiler's water level fell too low. Repairs would have been costly, so the engine was scrapped and the tender salvaged as a water car.

Weyerhaeuser Timber 2-6-6-2 "Mallet Mogul" Locomotives in the USA (2024)

FAQs

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Under the Whyte notation for the classification of steam locomotives, 2-6-2 represents the wheel arrangement of two leading wheels, six coupled driving wheels and two trailing wheels. This arrangement is commonly called a Prairie.

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No. 4014 is the largest, heaviest, and most powerful operational steam locomotive in the world. Two of Union Pacific's Challengers survived into preservation. Challenger #3985 was the largest operational steam locomotive in the world until the restoration of UP 4014.

Why is a 4 6 2 locomotive called a Pacific? ›

Origin of the name

Usually, however, new wheel arrangements were named for, or named by, the railroad which first used the type in the United States. In the case of the Pacific, that was the Missouri Pacific Railroad in 1902.

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Crocodile (German Krokodil) electric locomotives are so called because they have long "noses" at each end, reminiscent of the snout of a crocodile (see also Steeplecab). These contain the motors and drive axles, and are connected by an articulated center section.

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Identification. An F9 can be distinguished reliably from a late F7 only by the addition of an extra filter grille ahead of the front porthole on the side panels on A units. Internally, the use of an 567C prime mover increased power to 1,750 hp (1.30 MW) from the F7's 1,500 hp (1.12 MW).

What is the largest locomotive in the USA? ›

According to the Union Pacific Railroad, the train known as Big Boy No. 4014 is the world's largest operating steam locomotive. On its website, the railroad company reflects on the history of Big Boys, which started as 25 trains that were 132 feet long and originally weighed 1.2 million pounds.

What is the most famous locomotive in the world? ›

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For details of our current exhibitions, take a look at our what's on page. On 3 July 1938, the A4 class locomotive Mallard raced down Stoke Bank at 126mph to set a new steam locomotive world speed record. That record still stands.

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A short train on level track may only need the horsepower of a single locomotive, but it's common to need more horsepower than what a single unit can provide, so the railroad will allocate multiple units. A long heavy train on steep grades may have additional locomotives at the end or in the middle.

What is the most powerful locomotive in the Union Pacific? ›

Union Pacific 18 is an example of the most powerful locomotive ever built in America. Rated at 10,000hp, it consists of the cab unit; the main power unit containing a turbine engine, similar to a jet engine, numbered 18B; and a tender to carry fuel for the turbine.

Why do American locomotives have Cowcatchers? ›

A cowcatcher, also known as a pilot, is the device mounted at the front of a locomotive to deflect obstacles on the track that might otherwise damage or derail it or the train.

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Old Locomotives doesn't have toilets. But nowadays newly manufactured locomotives are having. But these toilets can be used once the loco is in stand position. In the moving position, toilets get doesn't get open.

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The Midland Railway 115 Class was the third of four classes of 4-2-2 steam locomotive, nicknamed "Spinners", designed by Samuel Waite Johnson.

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In the United States and elsewhere the 2-10-2 is known as the Santa Fe type, after the Atchison, Topeka and Santa Fe Railway that first used the type in 1903.

What is a 2 8 4 locomotive called? ›

Under the Whyte notation, a 2-8-4 is a steam locomotive that has two unpowered leading wheels, followed by eight coupled and powered driving wheels, and four trailing wheels. This locomotive type is most often referred to as a Berkshire, though the Chesapeake and Ohio Railway used the name Kanawha for their 2-8-4s.

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