Durham Transportation Company 2-6-0 "Mogul" Locomotives of the USA


Class Details by Steve Llanso of Sweat House Media

Class 5 (Locobase 13459)

Data from Baldwin Locomotive Works Specification for Engines as digitized by the DeGolyer Library of Southern Methodist University, Volume 32, p. 242. (Many thanks to Chris Hohl for his 18 June 2015 email and spreadsheet documenting the differences between the 5 and the 6, which had been lumped together under this entry's number; see Locobase 16120.) Works number was 32815 in June 1908.

This Texas short line opened in 1906, had mainline mileage estimated at somewhere between 27 and 55.5 miles. It's not clear from the Baldwin specifications if all of the rail weighed a modest 35 lb/yard (17.5 kg/metre). Certainly the 5 had frames beefed up for "rough service", which also called for the tender to have a "substantial" design.

The DTS line folded in 1913 and the 5 went to work for Chronister Lumber Company.


Class 6 (Locobase 16120)

Data from Baldwin Locomotive Works Specification for Engines as digitized by the DeGolyer Library of Southern Methodist University, Volume 32, p. 243. (Many thanks to Chris Hohl for his 18 June 2015 email and spreadsheet reporting the absence of this engine. Locobase had included it in the 5's entry without properly checking to see if the locomotive was the 5's duplicate. Hohl's spreadsheet clearly documented the difference and prompted this new entry.) Works number was 32815 in June 1908.

Bought at the same time as the 5 (Locobase 13459), the 6 was an appreciably smaller Mogul that was built to burn both coal and wood. Despite its smaller dimensions in most respect, the 6 had a 2" longer driving wheelbase, possibly because the firebox was 30" shorter, but considerably deeper.

The specs comment that the "long and low" tender's design was to be "substantial to withstand hard service."

Specifications by Steve Llanso of Sweat House Media
Class56
Locobase ID13,459 16,120
RailroadDurham Transportation CompanyDurham Transportation Company
CountryUSAUSA
Whyte2-6-02-6-0
Number in Class12
Road Numbers56
GaugeStdStd
Number Built12
BuilderBurnham, Williams & CoBurnham, Williams & Co
Year19081908
Valve GearStephensonStephenson
Locomotive Length and Weight
Driver Wheelbase (ft)1313
Engine Wheelbase (ft)21.0820.50
Ratio of driving wheelbase to overall engine wheebase 0.62 0.63
Overall Wheelbase (engine & tender) (ft)43.85
Axle Loading (Maximum Weight per Axle) (lbs)
Weight on Drivers (lbs)80,00059,000
Engine Weight (lbs)96,00072,000
Tender Loaded Weight (lbs)87,00077,999
Total Engine and Tender Weight (lbs)183,000149,999
Tender Water Capacity (gals)40003501
Tender Fuel Capacity (oil/coal) (gals/tons)87
Minimum weight of rail (calculated) (lb/yd)4433
Geometry Relating to Tractive Effort
Driver Diameter (in)4545
Boiler Pressure (psi)165165.30
High Pressure Cylinders (dia x stroke) (in)16" x 24"15" x 20"
Tractive Effort (lbs)19,14914,051
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.18 4.20
Heating Ability
Firebox Area (sq ft)100.5078.50
Grate Area (sq ft)20.3013.35
Evaporative Heating Surface (sq ft)1279761
Superheating Surface (sq ft)
Combined Heating Surface (sq ft)1279761
Evaporative Heating Surface/Cylinder Volume229.00186.04
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation33502207
Same as above plus superheater percentage33502207
Same as above but substitute firebox area for grate area16,58312,976
Power L139473496
Power MT326.31391.90


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