Data from Baldwin Locomotive Works Specification for Engines as digitized by the DeGolyer Library of Southern Methodist University, Volume 14, p. 115. See Locobase 16366 for a skeptical 1877 view of steam dummies and Locobase 11577 for a supporting 1889 discussion of the problems associated with running steam dummies on urban street railways. 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 | |
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Class | Merrill |
Locobase ID | 16319 |
Railroad | Coronado |
Country | USA |
Whyte | 0-4-2T |
Number in Class | 1 |
Road Numbers | 5 |
Gauge | Std |
Number Built | 1 |
Builder | Burnham, Parry, Williams & Co |
Year | 1888 |
Valve Gear | Stephenson |
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 wheelbase | 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 / Liters/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 | |
Tubes (number - dia) (in / mm) | 100 - 1.5" / 38 |
Flues (number - dia) (in / mm) | |
Flue/Tube length (ft / m) | 6.03 / 1.84 |
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 Volume | 211.81 |
Computations Relating to Power Output (More Information) | |
Robert LeMassena's Power Computation | 1131 |
Same as above plus superheater percentage | 1131 |
Same as above but substitute firebox area for grate area | 4550 |
Power L1 | 2651 |
Power MT | 649.38 |