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TRAIN S USA NORFOLK AND WESTERN RAILWAY Y6a CLASS MALLET TYPE ARTICULATED STEAM 2-8-8-2 LOCO No 2156 - BUILT AT THE RAILWAY COMPANY'S SHOPS AT ROANOKE IN 1942 - PHOTO BY WES BARRIS
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TRAIN S USA NORFOLK AND WESTERN RAILWAY Y6a CLASS MALLET TYPE ARTICULATED STEAM 2-8-8-2 LOCO No 2156 - BUILT AT THE RAILWAY COMPANY'S SHOPS AT ROANOKE IN 1942 - PHOTO BY WES BARRIS

Loco No 2156 is on display at the National Museum of Transportation in St Louis - USA It is a true Mallet steam locomotive. This means that it uses two-stage steam expansion. The two rear cylinders (in the middle of the locomotive) received steam at boiler pressure (300 psi). After expanding in the high-pressure cylinders, the steam would then be re-used in the front, larger, low-pressure cylinders. This process increased efficiency by extracting more energy from the steam before being exhausted. When run in this way, this locomotive could produce 126,831 pounds of pulling force. Like many Mallets, No 2156 could be temporarily run in "simple" mode when starting. This mode allowed higher pressure steam into the larger front cylinders. When run in this mode, the locomotive could produce 152,206 pounds of pulling force. That is more pulling force than produced by the Big Boy (135,375). It should be noted that "simple" mode was normally used just for starting a train and these locomotives were designed to use two-stage steam expansion. No 2156 is displayed in the yard between the Abbot Building and Roberts Pavilion.

Date
2023-04-06
Photographer / author
ausdew
Archive
Wikimedia Commons
Type
photograph
Original size
2,177 × 900 pixels

Public domain

Reason: public domain: author-FlickrPDM.

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"TRAIN S USA NORFOLK AND WESTERN RAILWAY Y6a CLASS MALLET TYPE ARTICULATED STEAM 2-8-8-2 LOCO No 2156 - BUILT AT THE RAILWAY COMPANY'S SHOPS AT ROANOKE IN 1942 - PHOTO BY WES BARRIS" (2023-04-06). ausdew, via Wikimedia Commons. Public domain. https://commons.wikimedia.org/wiki/File:TRAIN_S_USA_NORFOLK_AND_WESTERN_RAILWAY_Y6a_CLASS_MALLET_TYPE_ARTICULATED_STEAM_2-8-8-2_LOCO_No_2156_-_BUILT_AT_THE_RAILWAY_COMPANY%27S_SHOPS_AT_ROANOKE_IN_1942_-_PHOTO_BY_WES_BARRIS.jpg

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