USRA Designs

USRA Mikado Steam Engine

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Mechanical Stoker

 

 

 

The USRA Mikado's used a Duplex Type D (or D-1 as it was latter named as subsequent variations were released) mechanical stoker manufactured by the Locomotive Stoker Company of Pittsburgh, PA.. The 1922 Locomotive Cyclopedia of American Practices had a multi-page description of this popular stoker, the text and pictures of which are reproduced here.

 

In the D-1 type the two elevator screws both revolved in the same direction and only turn on the the inward stroke of the actuating plunger of the stoker motor. In the D-1-A, D-2 and D-3 types the screws revolved in opposite directions alternately on both strokes of the motor delivering the coal more evenly. The D-4 was a total redesign with a new two cylinder stoker motor with the two elevator screws turning continuously in the same direction, doubling the amount of coal that could be delivered.

 

Although words and drawings can provide a vivid description of a device, there is nothing like seeing it in person. Unfortunately there are few steam locomotives remaining and even fewer with intact Type D mechanical stokers. But, if you cannot see the full scale version, then an accurate scale model is next best thing. Such a scale mock-up exists at the Great Plains Transportation Museum in Wichita, KS. (http://www.gptm.us) Along with the Type D stoker scale mock-up, which was produced by the Locomotive Stoker Company and used by the railroads as a training device, the museum hosts the Santa Fe #3768 steam locomotive and numerous other displays. Well worth a visit and your support.

 

The pictures below, shot by J. H. Koehn, President of GPTM, show the accuracy and wealth of details that was built into the mock-up. My thanks to J. H. Koehn for permitting me to share these pictures.

 

Click on picture for a larger view

 

USRA Tender

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USRA Tender

USRA Tender

USRA Tender

USRA Tender

 

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