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

Introduction

The Texas & Pacific Railroad received the very first purposely designed 2-10-4 built in North America. The Lima Locomotive Works delivered it in 1925 as part of an order for ten "Texas" type locomotives. This group was designated as Class I-1 and was assigned road numbers 600-609. They had 63.5" diameter drivers, 29" x 30" cylinders, a 250 psi boiler pressure, a tractive effort of 83,000 pounds and each weighed 448,000 pounds.

As was the custom, the first railroad to receive a new wheel arrangement was given the honor of giving of naming it and T&P selected the name "Texas" for the 2-10-4s.

Fifteen more "Texas" type locomotives were delivered from Lima in 1927. These Class I-1a 2-10-4s were given road numbers 610 through 624 and were duplicates of the first ten, except the boiler pressure was raised to 255 psi, which increased the tractive effort to 84,600 pounds.

In 1928, thirty more were delivered fifteen were designated as Class I-1b and assigned road numbers 625 through 639 and fifteen were designated as Class I-1c and assigned road numbers 640 through 654. All thirty were built by Lima and were very similar to the 1927 group except the weight of each was 452,000 pounds.

A final 15 designated as Class I-1d with road numbers 655 through 669 arrived in 1929 to complete T&P's roster of seventy. These last locomotives, built by Lima, were very close copies of the previous class except each weighed 457,000 pounds.

There is one surviving T&P "Texas", number 610 which is owned by the Texas Stare Railroad and is on Static display in Palestine, TX. Number 610 was restored to operating condition and it hauled the American Freedom Train throughout the southwest during the 1976 bicentennial celebration.

Roster by Richard Duley

ClassQty.Road NumberYear Built Builder Notes
I-110600-6091925Lima1
I-1a15610-6241927Lima1
I-1b15625-6391928Lima1
I-1c15640-6541928Lima1
I-1d15655-6691929Lima1
Notes:
  1. All of the T&P 2-10-4 locomotives were scrapped by the early 1950s.

Class Details by Steve Llanso

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,the 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:

Class Works Road Year Remarks

I-1 6959-6968 600-609 1925 60,000 lb axle loading

I-1-A 7237-7251 610-624 1927 60,600 lb axle loading

I-1-B 7297-7211 625-639 1928

I-1-C 7314-7328 640-654 1928

I-1-D 7428-7442 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 by Steve Llanso
ClassI-1
Locobase ID99
RailroadTexas & Pacific (T & P)
CountryUSA
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 of rail (calculated) on which locomotive could run101 lb/yard
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 sq. ft
Superheating Surface2100 sq. ft
Combined Heating Surface7213 sq. ft
Evaporative Heating Surface/Cylinder Volume209.00
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation25500
Same as above plus superheater percentage32895
Same as above but substitute firebox area for grate area155593
Power L128870
Power MT1050.29

Photos

Reference

Credits

Introduction and roster provided by Richard Duley. Class details and specifications provided by Steve Llanso of Sweat House Media.