Coronado 0-4-2 Locomotives in the USA

Class Details by Steve Llanso of Sweat House Media

Class Merrill (Locobase 16319)

Data from Baldwin Locomotive Works Specification for Engines as digitized by the DeGolyer Library of Southern Methodist University, Volume 14, p. 115. For a summary of San Diego steam street railway history see William Ellsworth Smythe, History of San Diego, 1542-1907: Volume I - Old Town (San Diego: The History Company, 1908), especially pp. 439-440. Works number was 9150 in March 1888.

Baldwin's spec shows that the orginal order filled out on 23 November 1887 called for two motors to be delivered to the San Diego Street Car Company as their 5 and 6. But that buyer's name was lined out in the order and only one locomotive was sold to Coronado Railroad.

Several sources state that the buyer was the Southern California Motor Road.

The Southern Pacific gained control of the 5 in 1898. The SP sold the 5 to Willetts & Burr, local railroad contractors in 1907. Among its later jobs for W&B was supporting the 1913 project to extend the SP's Coos Bay branch in Oregon

NB: Locobase found that several other steam motor orders built at the same time to similar specs had nearly all dimensions exactly equal to those of the Coronado engine. Even though the specs for the latter do not include heating surface area, Locobase believes them to have been the same as the others.

Principal Dimensions by Steve Llanso of Sweat House Media
Locobase ID16,319
Number in Class1
Road Numbers5
Number Built1
BuilderBurnham, Parry, Williams & Co
Valve GearStephenson
Locomotive Length and Weight
Driver Wheelbase (ft / m) 4.50 / 1.37
Engine Wheelbase (ft / m) 9.67 / 2.95
Ratio of driving wheelbase to overall engine wheebase 0.47
Overall Wheelbase (engine & tender) (ft / m) 9.67 / 2.95
Axle Loading (Maximum Weight per Axle) (lbs / kg)
Weight on Drivers (lbs / kg)18,000 / 8165
Engine Weight (lbs / kg)24,000 / 10,886
Tender Loaded Weight (lbs / kg)
Total Engine and Tender Weight (lbs / kg)
Tender Water Capacity (gals / ML)400 / 1.52
Tender Fuel Capacity (oil/coal) (gals/tons / ML/MT)
Minimum weight of rail (calculated) (lb/yd / kg/m)15 / 7.50
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)35 / 889
Boiler Pressure (psi / kPa)130 / 9
High Pressure Cylinders (dia x stroke) (in / mm)10" x 14" / 254x356
Tractive Effort (lbs / kg)4420 / 2004.88
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.07
Heating Ability
Firebox Area (sq ft / m2)35 / 3.25
Grate Area (sq ft / m2) 8.70 / 0.81
Evaporative Heating Surface (sq ft / m2)269 / 24.99
Superheating Surface (sq ft / m2)
Combined Heating Surface (sq ft / m2)269 / 24.99
Evaporative Heating Surface/Cylinder Volume211.37
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation1131
Same as above plus superheater percentage1131
Same as above but substitute firebox area for grate area4550
Power L12646
Power MT648.16

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