Davenport  
Duplex Geared Steam Locomotives

Geared Steam Locomotive Works

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Insular Lumber Co. #4 - Manila (Negros Is), Philippines 340p


    Doniphan, Kensett, & Searcy RR #3 - Doniphan (White County), Arkansas 240dp

Duplex Rod / Gear Hybrid


The duplex model was built with the boiler,  crew cab, and tender mounted on a single elongated frame similar to a "forney" rod type locomotive.   The frame rested on two independently powered and geared trucks.    Each truck consisted of four drivers,  two steam cylinders, valve gearing, main and side rods, and  a sealed "oil-tight" gear box.  Except for the gear box crank disk, the truck looked similar to a miniature 0-4-0 rod type locomotive without the cab and boiler.  > One of the shortfalls of the overall design was the extensive "flexible" steam plumbing required to supply steam from the boiler to the cylinders which were mounted on the constantly swiveling trucks. 240d 

Very little technical and owner information is known about these locomotives.   From image observations and an incomplete owner roster we have learned they were at very least built :    

 

The locomotives looked similar to the non-geared duplex locomotive built by the Vulcan Iron Works of Wilkes Barre, Pennsylvania.  


Gear Case:

The gear case housed a complex arrangement of several spur gears in an sealed, oil tight and dust proof case.  


Power Trucks:

As mentioned earlier,  each truck swiveled independently of the other.  Each consisted of four drivers,  two steam cylinders, valve gearing, main and side rods, and  a sealed "oil-tight" and "dust proof" gear box.  Except for the gear box crank disk, the truck looked similar to a miniature 0-4-0 rod type locomotive without a cab or boiler.  Flexible steam piping supplied the steam to the cylinders.


Roster:

C/N Built

Ga.
inches

Wt.
tons

Cyl.
inches
12d

Owners
(1st to last)

Location
1240 05/1912

42"

_ 10x14

Insular Lumber Co. #4 

Manila (Negros Is), Philippines 

1412 07/1913 Std _ 10x14

Doniphan Lumber Co. #3 (Doniphan, Kensett, & Searcy RR) 

Doniphan, Arkansas 

1472 05/1914 36" 32

290d

8x12

Walker-Hopkins Lumber Co. #2 - sold 1921
Vida Lumber Co. #5
______purchased 1921 - scrapped  09/1926

Moyers, Oklahoma 
Lomax, Alabama

1474 11/1915 Std _ 10x14

Kansas City, Ozark & Southern Railway 16dd

Mansfield, Missouri

1535 08/1916 36" _ 9x12

Walker Logging Co. 

Moyers, Oklahoma

Roster compiled and furnished courtesy of Roy Keeley.   Superscripted foot notes denote additional information provided by other sources. 

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Page changed: June 06, 2013 03:14:21 PM