2-4-4-2
InWhyte notation,2-4-4-2refers to arailroadsteam locomotivethat has twoleading wheelsfollowed by two sets of four coupleddriving wheelsand twotrailing wheels.
Equivalent classifications
[edit]Other equivalent classifications are:
- UIC classification:1BB1(also known as German classification andItalian classification)
- French classification:120+021
- Turkish classification:23+23
- Swiss classification:2/3+2/3
For aMallet locomotivetheUIC classificationis refined to(1'B)B1'
A similar wheel arrangement has been used forGarratt locomotives,but it is referred to as2-4-0+0-4-2since both engine units can pivot.
US examples
[edit]This articulated wheel arrangement was rare in North America; example was theMallet locomotive.Most were built as logging locomotives, presumably to better negotiate the uneven (and often temporary) trackwork that characterized such operations. The added mechanical complexity was found to be of limited value, as reflected in their modest production and use.[1]
There is one known surviving example:Columbia River Belt Line No. 7"Skookum" (former Little River No. 126), built by Baldwin Locomotive Works in June 1909. It was retired and abandoned in place in the forest following a derailment in 1955. As of January 2023, it has been restored to operating condition following a 15 year rebuild at theOregon Coast Scenic Railroadshop inGaribaldi, Oregon.The engine currently resides at theNiles Canyon RailwayinSunol California.[2][3][4][5]
New Zealand
[edit]One 2-4-4-2 steam locomotive is known to have run in New Zealand.
TTT Number 7
[edit]Built byALCO (shop # 53970),this locomotive is aMallet Compoundtype, built for theTaupo Totara Timber Companyfor use on their 51 miles (82 km)TTT RailwaybetweenPutāruruandMokaiin the North Island. It hauled timber trains over the TTT Railway northern section, while Heisler types worked the mountainous southern section. However, Number 7 was regularly serviced at the company's Mokai engineering workshop. To reach Mokai, this locomotive successfully negotiated the southern section with curves as tight as 99 feet (30 m) radius. It is now preserved on theGlenbrook Vintage Railway,near Auckland, New Zealand, and is designated GVR Number 4. The engine is currently out of service awaiting overhaul, but can still be seen at the railway's Pukeoware workshops.
References
[edit]- ^LaMassena, Robert (1982).Articulated Steam Locomotives of N. America.Sundance. p. 7.ISBN0-913582-09-3.
- ^"October 2018 | Trains Magazine".
- ^"'Skookum' photo charter sold out; wait list started for second session | Trains Magazine ".
- ^"2022 steam locomotive list spring update".Trains.6 July 2022.Retrieved2023-01-06.
- ^Walter, Tim (2022-04-06)."Skookum (Deep River Logging #7) | Steam Giants".Retrieved2023-01-06.
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