Texas & Pacific 2-10-4 "Texas" Type Locomotives

Class I-1 (Locobase 99)

Data from table in 1930 Locomotive Cyclopedia, supplemented by data from T&P 1 - 1950ca Locomotive Diagrams supplied in May 2005 by Allen Stanley from his extensive collection.

This was the class that named the 2-10-4 wheel arrangement and certainly the T & P was one of the largest single users of these enormous locomotives. The firebox had a combustion chamber and thermic syphons, boiler had Elesco feedwater heater, the Baker valve gear had limited cutoff and actuated 14" piston valves. Although they did encounter counterbalancing problems because of their small drivers, Drury (1993) reports that they reaped a 33% increase in speed pulling 44% more tonnage while burning 42% less fuel.

Procured in five batches:

I-1: 600-609 1925 - 60,000 lb axle loading

I-1-A: 610-624 1927 - 60,600 lb axle loading

I-1-B: 625-639 1928

I-1-C: 640-654 1928

I-1-D: 655-669 1929 - 61,400 lb max axle loading

Those that were upgraded with Timken roller bearings on all axles -- 608, 657, 666 -- were redesignated I-2 in 1948.

Specifications
ClassI-1
Locobase ID99
RailroadTexas & Pacific (T & P)
Whyte2-10-4
Road Numbers600-669
GaugeStd
BuilderLima
Year1925
Valve GearBaker
Locomotive Length and Weight
Driver Wheelbase22'
Engine Wheelbase46.70'
Ratio of driving wheelbase to overall engine wheebase 0.47
Overall Wheelbase (engine & tender)86.67'
Axle Loading (Maximum Weight per Axle)60600 lbs
Weight on Drivers303000 lbs
Engine Weight452000 lbs
Tender Light Weight277166 lbs
Total Engine and Tender Weight729166 lbs
Tender Water Capacity14000 gals
Tender Fuel Capacity (oil/coal)5000 gals
Minimum weight per yard of rail on which locomotive could run101 lb rail
Geometry Relating to Tractive Effort
Driver Diameter63"
Boiler Pressure255 psi
Cylinders (dia x stroke)29" x 32"
Tractive Effort92590 lbs
Factor of Adhesion (Weight on Drivers/Tractive Effort) 3.27
Heating Ability
Firebox Area473 sq. ft
Grate Area100 sq. ft
Evaporative Heating Surface5113
Superheating Surface2100
Combined Heating Surface7213
Evaporative Heating Surface/Cylinder Volume209.00
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation25500
Same as above plus superheater percentage33150
Same as above but substitute firebox area for grate area156800
Power L128870
Power MT1050.29

Credits

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

This page last modified: . [Contact] All material © 1999-2008 SteamLocomotive.com