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Locomotive, Steam, 2-Truck Shay

Vehicle - Rail - Locomotive - 2-Truck Shay
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NameLocomotive, Steam, 2-Truck Shay
RegionNorth America
CategoryRail
TypeLocomotive
SubTypeSteam
Variety2-Truck Shay
ManufacturerVarious (Details)
EraNA Era II: Late Steam (1901 - 1938)



History: The Shay locomotive was the most widely used geared steam locomotive. The locomotives were built to the patents of Ephraim Shay, who has been credited with the popularization of the concept of a geared steam locomotive. Although the design of Ephraim Shay's early locomotives differed from later ones, there is a clear line of development that joins all Shays.

Shay locomotives had regular fire-tube boilers offset to the left to provide space for, and counterbalance the weight of, a two or three cylinder "motor," mounted vertically on the right with longitudinal drive shafts extending fore and aft from the crankshaft at wheel axle height. These shafts had universal joints and square sliding prismatic joints to accommodate the swiveling trucks. Each axle was driven by a separate bevel gear, with no side rods.

The strength of these engines is that all wheels, including, in some engines, those under the tender, are driven so that all the weight develops tractive effort. A high ratio of piston strokes to wheel revolutions allowed them to run at partial slip, where a conventional rod engine would spin its drive wheels and burn rails, losing all traction.

Shay locomotives were often known as sidewinders or stemwinders for their side-mounted drive shafts. Most were built for use in the United States, but many were exported, to about thirty countries, either by Lima, or after they had reached the end of their usefulness in the US.

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Railroad/Company:
This set of items is comprised of more than one name. Please look at the component items for details on the specific roadnames and/or manufacturers.

Item Links: We found: 1 different collections associated with Rail - Locomotive - 2-Truck Shay
Item created by: gdm on 2018-05-25 12:33:16. Last edited by gdm on 2018-05-25 12:34:16

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