Central Vermont 2-10-4 "Texas" Locomotives in the USA

Class Details by Steve Llanso of Sweat House Media

Class T-3a (Locobase 94)

Data from 1930 Locomotive Cyclopedia and confirmed by CV 1957 Locomotive Diagrams supplied in May 2005 by Allen Stanley from his extensive Rail Data Exchange. (Many thanks to Chris Hohl for his 22 September 2017 email reporting unlikely boiler pressure values for 177 entries. A Locobase macro caused the error .) Works numbers were 67671 in October 1928, 67672-67678 in November, 67767-67768 in December.

Firebox had 80 sq ft (7.4 sq m) of thermic syphons and 22 sq ft (2 sq m) in three arch tubes, boiler had Elesco feedwater heater, valve gear had limited cutoff. The Cyclopedia table shows Walschaert, the diagram showed Baker Long Lap valve gear.

They were relatively light, small, and low-drivered. Nevertheless, these engines rattled windows and shook the ground, according to a December 1993 Trains recollection. And they weren't kind to the rails.

Principal Dimensions by Steve Llanso of Sweat House Media
Locobase ID94
RailroadCentral Vermont (CNR)
Number in Class10
Road Numbers700-709
Number Built10
Valve GearBaker
Locomotive Length and Weight
Driver Wheelbase (ft / m)22 / 6.71
Engine Wheelbase (ft / m)44.20 / 13.47
Ratio of driving wheelbase to overall engine wheebase 0.50
Overall Wheelbase (engine & tender) (ft / m)82.18 / 25.05
Axle Loading (Maximum Weight per Axle) (lbs / kg)
Weight on Drivers (lbs / kg)285,000 / 129,274
Engine Weight (lbs / kg)419,000 / 190,055
Tender Loaded Weight (lbs / kg)269,600
Total Engine and Tender Weight (lbs / kg)688,600
Tender Water Capacity (gals / ML)13,500 / 51.14
Tender Fuel Capacity (oil/coal) (gals/tons / ML/MT)20 / 18.20
Minimum weight of rail (calculated) (lb/yd / kg/m)95 / 47.50
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)60 / 1524
Boiler Pressure (psi / kPa)250 / 17.20
High Pressure Cylinders (dia x stroke) (in / mm)27" x 32" / 686x813
Tractive Effort (lbs / kg)82,620 / 37475.85
Factor of Adhesion (Weight on Drivers/Tractive Effort) 3.45
Heating Ability
Firebox Area (sq ft / m2)423 / 39.31
Grate Area (sq ft / m2)84.40 / 7.84
Evaporative Heating Surface (sq ft / m2)4703 / 437.08
Superheating Surface (sq ft / m2)2208 / 205.20
Combined Heating Surface (sq ft / m2)6911 / 642.28
Evaporative Heating Surface/Cylinder Volume221.78
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation21,100
Same as above plus superheater percentage27,852
Same as above but substitute firebox area for grate area139,590
Power L131,466
Power MT1217.03

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