After some debate, Congress authorized the establishment of the United States Reclamation Service in June 1902 to undertake irrigation projects in the West. The agency originally operated within the US Geological Survey but was set off as an independent bureau in 1907. Projects included dams, channels and canals, and other large earth-moving efforts.
One of the USRS's projects was the Boise Project, which irrigated 230,000 acres (359 sq miles/931 sq km) of western Idaho. A major feature of the effort was the Arrowrock Dam, construction of which involved building the 20-mile (32 km) Boise & Arrowrock up to the site. Designated a common carrier, the B&A carried passengers and freight as the first publicly owned railroad in the United States.
As part of the B&A's equipment, this Mogul was purchased new by the USRS along with several passenger coaches. The contract was let on 15 June 1911 and the engine was valued at $10,140. The railroad operated only as long as construction continued, but in that five-year span, says Wikipedia, " [T]he train ran faithfully through the canyon, delivering over 89,500 visitors and crewmen. And during its commission, the Boise & Arrowrock traveled more than 110,000 miles (180,000 km) and carried 14,000,000 tons of freight."
When the Arrowrock Dam was completed in October 1915 (as the then-tallest dam in the world), the B&A's principal demand source dried up and, after a few months of conveying visitors to gaze upon the dam and reservoir, the B&A closed on 11 August 1916.
These Moguls have relatively tall drivers and were probably mixed traffic engines. In 1915, three were converted to 4-4-0s (see 5995).
|Principal Dimensions by Steve Llanso of Sweat House Media|
|Railroad||Boise & Arrowrock||Bangor & Aroostook|
|Number in Class||1||4|
|Locomotive Length and Weight|
|Driver Wheelbase (ft / m)||12.50 / 3.81||17.25 / 5.26|
|Engine Wheelbase (ft / m)||20.67 / 6.30||24.92 / 7.60|
|Ratio of driving wheelbase to overall engine wheebase||0.60||0.69|
|Overall Wheelbase (engine & tender) (ft / m)||46 / 14.02|
|Axle Loading (Maximum Weight per Axle) (lbs / kg)|
|Weight on Drivers (lbs / kg)||101,000 / 45,813||107,500 / 48,761|
|Engine Weight (lbs / kg)||115,000 / 52,163||127,000 / 57,606|
|Tender Loaded Weight (lbs / kg)||70,000 / 31,752|
|Total Engine and Tender Weight (lbs / kg)||197,000 / 89,358|
|Tender Water Capacity (gals / ML)||3700 / 14.02|
|Tender Fuel Capacity (oil/coal) (gals/tons / ML/MT)||5 / 4.50|
|Minimum weight of rail (calculated) (lb/yd / kg/m)||56 / 28||60 / 30|
|Geometry Relating to Tractive Effort|
|Driver Diameter (in / mm)||50 / 1270||63 / 1600|
|Boiler Pressure (psi / kPa)||180 / 12.40||180 / 12.40|
|High Pressure Cylinders (dia x stroke) (in / mm)||18" x 24" / 457x610||18" x 24" / 457x610|
|Tractive Effort (lbs / kg)||23,795 / 10793.24||18,885 / 8566.10|
|Factor of Adhesion (Weight on Drivers/Tractive Effort)||4.24||5.69|
|Firebox Area (sq ft / m2)||135 / 12.54||160 / 14.87|
|Grate Area (sq ft / m2)||28.30 / 2.63||18.25 / 1.70|
|Evaporative Heating Surface (sq ft / m2)||1639 / 152.27||1708 / 158.74|
|Superheating Surface (sq ft / m2)|
|Combined Heating Surface (sq ft / m2)||1639 / 152.27||1708 / 158.74|
|Evaporative Heating Surface/Cylinder Volume||231.87||241.63|
|Computations Relating to Power Output (More Information)|
|Robert LeMassena's Power Computation||5094||3285|
|Same as above plus superheater percentage||5094||3285|
|Same as above but substitute firebox area for grate area||24,300||28,800|