Data from Baldwin Locomotive Works Specification for Engines as digitized by the DeGolyer Library of Southern Methodist University Volume 51, p. 365. See also "Mikado Type Locomotives for the Raritan River Railroad ...", Railway and Locomotive Engineering, Volume 29, No 5 (May 1916), p. 164. Works numbers were 42734-42735 in December 1915, 42984 in February 1916, 43058-43059 in March.
R&LE pointed out that although this quintet of light Mikados mustered the same tractive effort as the earlier Consolidations (Locobase 12845), they presented 34% more grate area and 48% more heating surface area. The accompanying photograph shows them to be slim, well-proportioned engines capabale of running on 60 lb/yard (30 kg/metre) rail found on the branch lines and spurs, although the Raritan used 80 lb (40 kg) rail on its 12.3 mile (19.8 km) main line. Moreover, adding a trailing truck enhanced the Mikados' usefulness in the backing and switching that made up a significant part of their operation.
11 suffered a wreck when it collided with an out-of-control string of eight tank cars coming down a hill near South Amboy.
Except for the 12, which was scrapped in 1938, they provided the biggest freight muscle on the RRRR throughout World War II. 11 went to the ferro-knacker in December 1947, 9 in March 1948 and 10 in July. 14 held on the longest, serving more than 35 years before it was scrapped in September 1953.
Principal Dimensions by Steve Llanso of Middle Run Media | |
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Class | 9 |
Locobase ID | 12846 |
Railroad | Raritan River |
Country | USA |
Whyte | 2-8-2 |
Number in Class | 5 |
Road Numbers | 9-12, 14 |
Gauge | Std |
Number Built | 5 |
Builder | Baldwin |
Year | 1915 |
Valve Gear | Walschaert |
Locomotive Length and Weight | |
Driver Wheelbase (ft / m) | 13.67 / 4.17 |
Engine Wheelbase (ft / m) | 29 / 8.84 |
Ratio of driving wheelbase to overall engine wheelbase | 0.47 |
Overall Wheelbase (engine & tender) (ft / m) | 60.96 / 18.58 |
Axle Loading (Maximum Weight per Axle) (lbs / kg) | |
Weight on Drivers (lbs / kg) | 128,000 / 58,060 |
Engine Weight (lbs / kg) | 167,000 / 75,750 |
Tender Loaded Weight (lbs / kg) | 130,000 / 58,967 |
Total Engine and Tender Weight (lbs / kg) | 297,000 / 134,717 |
Tender Water Capacity (gals / ML) | 7000 / 26.52 |
Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT) | 12 / 11 |
Minimum weight of rail (calculated) (lb/yd / kg/m) | 53 / 26.50 |
Geometry Relating to Tractive Effort | |
Driver Diameter (in / mm) | 51 / 1295 |
Boiler Pressure (psi / kPa) | 200 / 1380 |
High Pressure Cylinders (dia x stroke) (in / mm) | 20" x 24" / 508x610 |
Tractive Effort (lbs / kg) | 32,000 / 14514.97 |
Factor of Adhesion (Weight on Drivers/Tractive Effort) | 4 |
Heating Ability | |
Tubes (number - dia) (in / mm) | 290 - 2" / 51 |
Flues (number - dia) (in / mm) | |
Flue/Tube length (ft / m) | 18.17 / 5.54 |
Firebox Area (sq ft / m2) | 149 / 13.85 |
Grate Area (sq ft / m2) | 44.20 / 4.11 |
Evaporative Heating Surface (sq ft / m2) | 2895 / 269.05 |
Superheating Surface (sq ft / m2) | |
Combined Heating Surface (sq ft / m2) | 2895 / 269.05 |
Evaporative Heating Surface/Cylinder Volume | 331.62 |
Computations Relating to Power Output (More Information) | |
Robert LeMassena's Power Computation | 8840 |
Same as above plus superheater percentage | 8840 |
Same as above but substitute firebox area for grate area | 29,800 |
Power L1 | 7088 |
Power MT | 488.32 |