The first three locomotives, delivered in 1937, were designated as Class D-48 and were assigned road numbers 401-403. The last three, delivered in 1939, were designated as Class D-47 and assigned road numbers 404 through 406. These six locomotives had 64" diameter drivers, 22" x 30" cylinders, a 245 psi boiler pressure, they exerted 47,247 pounds of tractive effort.
Numbers 401 through 403 weighed 280,000 pounds. The firebox was 277 square feet which included 26 square feet of arch tubes, the evaporative heating surface was 2,745 square feet and with the superheater was 3,617 square feet.
Numbers 404 through 406 weighed 285,000 pounds. The firebox was 277 square feet which included 26 square feet of arch tubes, the evaporative heating surface was 2,937 square feet and with the superheater was 4,121 square feet. .
By 1950 steam service was gone on the GB&W and the six "Mikados" were retired. After retirement, all six locomotives were stored at Green Bay's Norwood Yard in the hopes a second hand buyer would come forward. They were finally scrapped for $6,000 each in 1956.
There are no surviving Green Bay & Western 2-8-2 "Mikado" type locomotives
|Class||Qty.||Road Numbers||Year Built||Builder||Notes|
Many years after creating the first GB&W D-47 entry (Locobase 15), Locobase's compiler discovered that there were really two sub-classes. According to the builder's information that accompanied the first group, the tube-flue ratios were old school -- lots of 2" tubes, several dozen 5 1/2" flues. But #15, which was based on the 1947 Locomotive Cyclopedia entries, showed a "superpower" arrangement of many fewer 2" tubes, many more 3 1/2" flues. The latter's table, however, covered 404-406, which were delivered two years after the first three. The firebox was the same in all six and included 26 sq ft of arch tubes in its heating surface area.
These three, like the later three, served only until 1950, pulling freights at speeds of up to 65 mph (105 kph). Locobase doubts whether they were brought up to the later standard with a new boiler, but cannot say for sure.
A late Mike design with late-steam tube-to-flue ratio, but no change in the firebox that had 26 sq ft (2.42. sq m) of arch tubes included in the heating surface area. This was a subclass that followed the first three D-47s (Locobase 4950) by two years -- the earlier engines had a more conservative tube-flue arrangement.
All three of the 1939 batch arrived in October 1939 and each cost $91,667. Like the earlier trio, these engines could easily manage fast freights at speeds up to 65 mph (105 kph).
All three were retired in early March 1950.
|Specifications by Steve Llanso of Sweat House Media|
|Railroad||Green Bay & Western||Green Bay & Western|
|Number in Class||3||3|
|Locomotive Length and Weight|
|Driver Wheelbase (ft / m)||16.75 / 5.11||16.80 / 5.12|
|Engine Wheelbase (ft / m)||36.90 / 11.25||36.90 / 11.25|
|Ratio of driving wheelbase to overall engine wheebase||0.45||0.46|
|Overall Wheelbase (engine & tender) (ft / m)||72.18 / 22||72.18 / 22|
|Axle Loading (Maximum Weight per Axle) (lbs / kg)|
|Weight on Drivers (lbs / kg)||201,800 / 91,535||204,000 / 92,533|
|Engine Weight (lbs / kg)||280,000 / 127,006||285,000 / 129,274|
|Tender Loaded Weight (lbs / kg)||174,300 / 79,061||176,000 / 79,832|
|Total Engine and Tender Weight (lbs / kg)||454,300 / 206,067||461,000 / 209,106|
|Tender Water Capacity (gals / ML)||9000 / 34.09||9000 / 34.09|
|Tender Fuel Capacity (oil/coal) (gals/tons / ML/MT)||14 / 12.70||14 / 12.70|
|Minimum weight of rail (calculated) (lb/yd / kg/m)||84 / 42||85 / 42.50|
|Geometry Relating to Tractive Effort|
|Driver Diameter (in / mm)||64 / 1626||64 / 1626|
|Boiler Pressure (psi / kPa)||245 / 16.90||245.10 / 16.90|
|High Pressure Cylinders (dia x stroke) (in / mm)||22" x 30" / 559x762||22" x 30" / 559x762|
|Tractive Effort (lbs / kg)||47,247 / 21430.90||47,266 / 21439.52|
|Factor of Adhesion (Weight on Drivers/Tractive Effort)||4.27||4.32|
|Firebox Area (sq ft / m2)||277 / 25.74||277 / 25.73|
|Grate Area (sq ft / m2)||60.40 / 5.61||60.40 / 5.61|
|Evaporative Heating Surface (sq ft / m2)||2745 / 255.11||2937 / 272.96|
|Superheating Surface (sq ft / m2)||872 / 81.04||1184 / 110.04|
|Combined Heating Surface (sq ft / m2)||3617 / 336.15||4121 / 383|
|Evaporative Heating Surface/Cylinder Volume||207.97||222.52|
|Computations Relating to Power Output (More Information)|
|Robert LeMassena's Power Computation||14,798||14,804|
|Same as above plus superheater percentage||18,350||19,097|
|Same as above but substitute firebox area for grate area||84,153||87,582|