Caspar, South Fork & Eastern 2-6-6-2 "Mallet Mogul" Locomotives in the USA

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Class Details by Steve Llanso of Sweat House Media

Class Samson (Locobase 4050)

Data from http://loggingmallets.railfan.net and DeGolyer, Vol 73, pp. 241+. Works number was 56789 in July 1923.

This was a younger sister of the Trojan (Locobase 4049) with a higher-pressure superheated boiler and LP cylinders 1" larger in diameter. HP cylinders used 8" (203 mm) piston valves, LP cylinders were served by 10" (254 mm) diameter valves.

Samson had a similar career to the CSF&E's #5, serving the Californian logging road until 1945. It too was scrapped in 1958.


Class Trojan (Locobase 4049)

Data from DeGolyer, Volume 34, p.305. See also http://loggingmallets.railfan.net . Works number was 34875 in June 1910.

The CSF & E was a logging road that was opened in Mendocino County in California in 1874 and became the CSF & E in 1903.

This small Mallet--the smallest to operate in American service--operated for 35 years on a road that had maximum grades of 6%, curves with radii as tight as 30 degrees, and rails weighing between 35-40 lb/yard (17.5-20 kg/metre). It was delivered in pieces and reassembled on the road. Soon after its delivery, a note dated 12/22/1911 said that Engineer Sissler had written in two letters (1/8 and 1/13) that he had bored out the HP cylinders from their original 13" diameter to the 13 17/32" shown in Locobase's specs and that the valve lap had been reduced from 7/8" to 13/16".

A strike in December 1945 closed the railroad and the sawmill. The sawmill reopened but the railroad was abandoned. After this enforced retirement in 1945, the Trojan languished until it was scrapped in 1958.

Specifications by Steve Llanso of Sweat House Media
ClassSamsonTrojan
Locobase ID4050 4049
RailroadCaspar, South Fork & EasternCaspar, South Fork & Eastern
CountryUSAUSA
Whyte2-6-6-22-6-6-2
Number in Class11
Road Numbers75
GaugeStdStd
Number Built11
BuilderBaldwinBaldwin
Year19241910
Valve GearWalschaertWalschaert
Locomotive Length and Weight
Driver Wheelbase (ft / m) 6.83 / 2.0820.50 / 6.25
Engine Wheelbase (ft / m)20.50 / 6.2532.50 / 9.91
Ratio of driving wheelbase to overall engine wheebase 0.33 0.63
Overall Wheelbase (engine & tender) (ft / m)54.50 / 16.61
Axle Loading (Maximum Weight per Axle) (lbs / kg)
Weight on Drivers (lbs / kg)108,000 / 48,988104,000 / 47,174
Engine Weight (lbs / kg)129,000 / 58,513122,000 / 55,338
Tender Loaded Weight (lbs / kg)66,000 / 29,93780,000 / 36,287
Total Engine and Tender Weight (lbs / kg)195,000 / 88,450202,000 / 91,625
Tender Water Capacity (gals / ML)3000 / 11.364000 / 15.15
Tender Fuel Capacity (oil/coal) (gals/tons / ML/MT)1300 / 4.902000 / 7.60
Minimum weight of rail (calculated) (lb/yd / kg/m)30 / 1529 / 14.50
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)37 / 94037 / 940
Boiler Pressure (psi / kPa)220 / 15.20200 / 13.80
High Pressure Cylinders (dia x stroke) (in / mm)13" x 20" / 330x50813.53" x 20" / 344x508
Low Pressure Cylinders (dia x stroke) (in / mm)20" x 20" / 508x50819" x 20" / 483x508
Tractive Effort (lbs / kg)24,018 / 10894.3922,324 / 10126.01
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.50 4.66
Heating Ability
Firebox Area (sq ft / m2)80 / 7.43100 / 9.29
Grate Area (sq ft / m2)17.60 / 1.6418.20 / 1.69
Evaporative Heating Surface (sq ft / m2)1016 / 94.391193 / 110.83
Superheating Surface (sq ft / m2)218 / 20.25
Combined Heating Surface (sq ft / m2)1234 / 114.641193 / 110.83
Evaporative Heating Surface/Cylinder Volume330.67358.46
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation38723640
Same as above plus superheater percentage45693640
Same as above but substitute firebox area for grate area20,76820,000
Power L163023181
Power MT771.86404.59