Pacific Portland Cement ordered this Mikado and sized it to roll on 75 lb/yard (37.5 kg/metre) rail for the 7 miles between the quarries and the Southern Pacific junction at Auburn, Calif. It trailed a cylindrical Vanderbilt tender.
According to [external link], a triple-span concrete bridge was built in 1912 during construction to handle the 4 trains a day. Quarrying the huge limestone formation took place from 1912 to 1939. In 1942 the tracks were pulled out for scrap metal for WWII, but the "No-Hands Bridge" remains standing. Its nickname reportedly refers to a horseback rider who rode "no hands" as he and his mount (who deserves at least half of the credit) picked their way across the bridge 150 feet above the gorge using only the narrow railbed.
The 101 had long since gone to the Ray & Gila Valley in 1916 and remained on the line until it was sold to Kennecott Copper in December 1943.
This Mikado was small as 2-8-2s went, but sizable for the industrial line on which it operated. The specs guaranteed it would haul four loaded 50-ton standard steel cars, of either gondola or hopper bottom type, on 75 lb/yard (37.5 kg/metre) rail at 10 mph up a 3 1/2% grade with a 16 degree (359 foot/109.4 metre radius) curve.
In 1926, specifications required that the 103 had offer at least the hauling power of the 102. It weighed a ton more on the drivers and replaced the slide valves of the original design with 12" (305 mm) piston valves, but was otherwise a duplicate.
The 102 later ran on the Ray Consolidated Copper Company rails as their 17 in Hayden, Ariz. McCloud River bought the 17 in 1942 and ran it until 1955. 103 went from PPCC to the California & Oregon Coast in 1941.
|Principal Dimensions by Steve Llanso of Sweat House Media|
|Railroad||Mountain Quarries Company||Pacific Portland Cement Company|
|Number in Class||1||1|
|Locomotive Length and Weight|
|Driver Wheelbase (ft / m)||14 / 4.27||13.08 / 3.99|
|Engine Wheelbase (ft / m)||31.08 / 9.47||27 / 8.23|
|Ratio of driving wheelbase to overall engine wheebase||0.45||0.48|
|Overall Wheelbase (engine & tender) (ft / m)||60.79 / 18.53||55.33 / 16.86|
|Axle Loading (Maximum Weight per Axle) (lbs / kg)|
|Weight on Drivers (lbs / kg)||185,000 / 83,915||138,000 / 62,596|
|Engine Weight (lbs / kg)||232,000 / 105,234||177,000 / 80,286|
|Tender Loaded Weight (lbs / kg)||133,500 / 60,555||90,000 / 40,823|
|Total Engine and Tender Weight (lbs / kg)||365,500 / 165,789||267,000 / 121,109|
|Tender Water Capacity (gals / ML)||7000 / 26.52||4500 / 17.05|
|Tender Fuel Capacity (oil/coal) (gals/tons / ML/MT)||2940 / 11.10||2500 / 9.50|
|Minimum weight of rail (calculated) (lb/yd / kg/m)||77 / 38.50||58 / 29|
|Geometry Relating to Tractive Effort|
|Driver Diameter (in / mm)||51 / 1295||44 / 1118|
|Boiler Pressure (psi / kPa)||200 / 13.80||180 / 12.40|
|High Pressure Cylinders (dia x stroke) (in / mm)||22" x 28" / 559x711||20.5" x 28" / 521x711|
|Tractive Effort (lbs / kg)||45,173 / 20490.15||40,917 / 18559.66|
|Factor of Adhesion (Weight on Drivers/Tractive Effort)||4.10||3.37|
|Firebox Area (sq ft / m2)||193 / 17.93||160 / 14.86|
|Grate Area (sq ft / m2)||57 / 5.30||41.30 / 3.84|
|Evaporative Heating Surface (sq ft / m2)||3903 / 362.60||3108 / 288.74|
|Superheating Surface (sq ft / m2)|
|Combined Heating Surface (sq ft / m2)||3903 / 362.60||3108 / 288.74|
|Evaporative Heating Surface/Cylinder Volume||316.82||290.56|
|Computations Relating to Power Output (More Information)|
|Robert LeMassena's Power Computation||11,400||7434|
|Same as above plus superheater percentage||11,400||7434|
|Same as above but substitute firebox area for grate area||38,600||28,800|