Adirondack & St Lawrence/Central Vermont 2-4-6 Locomotives in the USA

Class Details by Steve Llanso of Sweat House Media

Class Saint Lawrence (Locobase 16391)

Data from "Inspection Locomotive", Railroad Gazette, Volume 24, No (18 March 1892), p.207. (Many thanks to Chris Hohl for his extensive research and his 3 December 2018 email, spreadsheet, and article link. Chris particularly cites Ron Goldfeder for his article, "The Inspection Locomotive." Railroad History. Spring-Summer 2012. Number 206. pgs. 20 & 32, and further assistance. ) Works number was 3639 in February 1892.

This inspection engine, with its "elegantly furnished" seating for eight ahead of the cab, was built to the order of the A&StL's president William Seward Webb. It was intended to be powerful enough to pull two sleeping cars "at usual speed." Doctor Webb's inspection engine,seated eight persons in the usuall extended car body that stretched from the footplate to just behind the smokebox and stack. Doors on either side of the smokebox improved forward visibility and the occupants could board or debark on steps mounted just ahead of the doors and outboard of the front truck.

The locomotive also was expected to pull two sleeping cars "at usual speed".

Probably because he was no longer president of the A&StL, which was merged into the New York Central in August 1892, Webb sold the Saint Lawrence to Edward Curtis, president of the Central Vermont. 99 didn't keep its number or its side tanks; see Locobase 16335.

Principal Dimensions by Steve Llanso of Sweat House Media

ClassSaint Lawrence
Locobase ID16391
RailroadAdirondack & St Lawrence/Central Vermont
Number in Class1
Road Numbers99/109
Number Built1
Valve GearStephenson
Locomotive Length and Weight
Driver Wheelbase (ft / m) 7.50 / 2.29
Engine Wheelbase (ft / m)31.10 / 9.48
Ratio of driving wheelbase to overall engine wheelbase 0.24
Overall Wheelbase (engine & tender) (ft / m)31.10 / 9.48
Axle Loading (Maximum Weight per Axle) (lbs / kg)
Weight on Drivers (lbs / kg)56,700 / 25,719
Engine Weight (lbs / kg)134,400 / 60,963
Tender Loaded Weight (lbs / kg)
Total Engine and Tender Weight (lbs / kg)134,400
Tender Water Capacity (gals / ML)2300 / 9.47
Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT)4 / 6
Minimum weight of rail (calculated) (lb/yd / kg/m)47 / 23.50
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)60 / 1524
Boiler Pressure (psi / kPa)160 / 11
High Pressure Cylinders (dia x stroke) (in / mm)16" x 22" / 406x559
Tractive Effort (lbs / kg)12,766 / 5790.57
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.44
Heating Ability
Tubes (number - dia) (in / mm)146 - 2" / 51
Flues (number - dia) (in / mm)
Flue/Tube length (ft / m)11.58 / 3.53
Firebox Area (sq ft / m2)91.77 / 8.53
Grate Area (sq ft / m2)14.38 / 1.34
Evaporative Heating Surface (sq ft / m2)971 / 90.21
Superheating Surface (sq ft / m2)
Combined Heating Surface (sq ft / m2)971 / 90.21
Evaporative Heating Surface/Cylinder Volume189.65
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation2301
Same as above plus superheater percentage2301
Same as above but substitute firebox area for grate area14,683
Power L14468
Power MT347.45

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Wes Barris