Pacific Portland Cement Company 2-8-2 "Mikado" Locomotives in the USA

Class Details by Steve Llanso of Sweat House Media

Class 102 (Locobase 14255)

Data from Baldwin Locomotive Works Specification for Engines as digitized by the DeGolyer Library of Southern Methodist University, Volume 52, p. 116. Works number was 42912 in February 1916 and 59126 in April 1926.

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
Locobase ID14,255
RailroadPacific Portland Cement Company
Number in Class1
Road Numbers102-103
Number Built1
Valve GearWalschaert
Locomotive Length and Weight
Driver Wheelbase (ft / m)13.08 / 3.99
Engine Wheelbase (ft / m)27 / 8.23
Ratio of driving wheelbase to overall engine wheebase 0.48
Overall Wheelbase (engine & tender) (ft / m)55.33 / 16.86
Axle Loading (Maximum Weight per Axle) (lbs / kg)
Weight on Drivers (lbs / kg)138,000 / 62,596
Engine Weight (lbs / kg)177,000 / 80,286
Tender Loaded Weight (lbs / kg)90,000 / 40,823
Total Engine and Tender Weight (lbs / kg)267,000 / 121,109
Tender Water Capacity (gals / ML)4500 / 17.05
Tender Fuel Capacity (oil/coal) (gals/tons / ML/MT)2500 / 9.50
Minimum weight of rail (calculated) (lb/yd / kg/m)58 / 29
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)44 / 1118
Boiler Pressure (psi / kPa)180 / 12.40
High Pressure Cylinders (dia x stroke) (in / mm)20.5" x 28" / 521x711
Tractive Effort (lbs / kg)40,917 / 18559.66
Factor of Adhesion (Weight on Drivers/Tractive Effort) 3.37
Heating Ability
Firebox Area (sq ft / m2)160 / 14.86
Grate Area (sq ft / m2)41.30 / 3.84
Evaporative Heating Surface (sq ft / m2)3108 / 288.74
Superheating Surface (sq ft / m2)
Combined Heating Surface (sq ft / m2)3108 / 288.74
Evaporative Heating Surface/Cylinder Volume290.56
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation7434
Same as above plus superheater percentage7434
Same as above but substitute firebox area for grate area28,800
Power L14823
Power MT308.20