Terminal Railroad Assn of St Louis 2-6-0 "Mogul" Locomotives in the USA

Class Details by Steve Llanso of Sweat House Media

Class K (Locobase 7309)

Locomotive data from TRRA 1939 Locomotive Diagram book supplied in May 2005 by Allen Stanley from his extensive Rail Data Exchange. See also DeGolyer, Volume 22, p. 168. (Thanks to Chris Hohl for his 18 July 2016 email noting the original tender capacity.) Works number was 17005 in September 1899.

This was the only locomotive in the TRRA's 1939 diagram book delivered with either a leading or trailing truck; everything else was an all-adhesion switcher. The small diameter cylinders had the longest stroke of any 17" cylinder Mogul for US service. Its original tender capacity is shown in the specs. A later tender carried 4,000 US gallons (15,140 litres) and 6 tons (5.45 tonnes) of coal.

According to the website of the TRRA's Historical and Technical Society, Inc (http://trra-hts.railfan.net/, accessed 14 December 2005), the TRRA was formed in 1889 to coordinate terminal operations around the St Louis Union Station and environs. It "quickly" became the largest freight and passenger terminal operation in the world.

Principal Dimensions by Steve Llanso of Sweat House Media
Locobase ID7309
RailroadTerminal Railroad Assn of St Louis
Number in Class1
Road Numbers37/1
Number Built1
BuilderBurnham, Williams & Co
Valve GearStephenson
Locomotive Length and Weight
Driver Wheelbase (ft / m)11 / 3.35
Engine Wheelbase (ft / m)18.50 / 5.64
Ratio of driving wheelbase to overall engine wheebase 0.59
Overall Wheelbase (engine & tender) (ft / m)45.33 / 13.82
Axle Loading (Maximum Weight per Axle) (lbs / kg)
Weight on Drivers (lbs / kg)76,000 / 34,473
Engine Weight (lbs / kg)89,000 / 40,370
Tender Loaded Weight (lbs / kg)66,000 / 29,937
Total Engine and Tender Weight (lbs / kg)155,000 / 70,307
Tender Water Capacity (gals / ML)3300 / 12.50
Tender Fuel Capacity (oil/coal) (gals/tons / ML/MT)5 / 4.50
Minimum weight of rail (calculated) (lb/yd / kg/m)42 / 21
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)56 / 1422
Boiler Pressure (psi / kPa)180 / 12.40
High Pressure Cylinders (dia x stroke) (in / mm)17" x 26" / 432x660
Tractive Effort (lbs / kg)20,529 / 9311.81
Factor of Adhesion (Weight on Drivers/Tractive Effort) 3.70
Heating Ability
Firebox Area (sq ft / m2)121.42 / 11.28
Grate Area (sq ft / m2)20.20 / 1.88
Evaporative Heating Surface (sq ft / m2)1265 / 117.52
Superheating Surface (sq ft / m2)
Combined Heating Surface (sq ft / m2)1265 / 117.52
Evaporative Heating Surface/Cylinder Volume185.20
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation3636
Same as above plus superheater percentage3636
Same as above but substitute firebox area for grate area21,856
Power L14605
Power MT400.75

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