Reading 4-8-4 "Northern" Type Locomotives

Class T1 (Locobase 275)

Firebox had thermic syphons.

Trailing-truck booster added 11,100 lb to starting tractive effort. These engines were built using the boilers from 30 I-10 2-8-0s. The back end was unchanged, the front lengthened. Drivers had friction bearings, lead and trailing trucks used Timken roller bearings.

Specifications
ClassT1
Locobase ID275
RailroadReading
Whyte4-8-4
Road Numbers2100-2129
GaugeStd
BuilderReading
Year1945
Valve GearWalschaert
Locomotive Length and Weight
Driver Wheelbase19.25'
Engine Wheelbase45.83'
Ratio of driving wheelbase to overall engine wheebase 0.42
Overall Wheelbase (engine & tender)
Axle Loading (Maximum Weight per Axle)69740 lbs
Weight on Drivers278200 lbs
Engine Weight441300 lbs
Tender Light Weight367700 lbs
Total Engine and Tender Weight809000 lbs
Tender Water Capacity19000 gals
Tender Fuel Capacity (oil/coal)26 tons
Minimum weight per yard of rail on which locomotive could run115.92 lb rail
Geometry Relating to Tractive Effort
Driver Diameter70"
Boiler Pressure240 psi
Cylinders (dia x stroke)27" x 32"
Tractive Effort67984 lbs
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.09
Heating Ability
Firebox Area465 sq. ft
Grate Area94.40 sq. ft
Evaporative Heating Surface4920
Superheating Surface1214
Combined Heating Surface6134
Evaporative Heating Surface/Cylinder Volume232.01
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation22656
Same as above plus superheater percentage27139.92
Same as above but substitute firebox area for grate area133687.12
Power L123992.93
Power MT760.54

Credits

Introduction and specifications provided by Steve Llanso of Sweat House Media.