Data from T&P 1 - 1922 & T&P 1950ca Locomotive Diagrams supplied in May 2005 by Allen Stanley from his extensive Rail Data Exchange. Works numbers were 1343-1344 in January 1882, 1357-1361 in February.
The first two locomotives were ordered by Pacific Improvement Co; the books show
the latter five had International Improvement Co. as the buyer. At some point, the T&P converted the coal-burners to oil-burning.
The entire class remained in service for more than 30 years. 119 was scrapped in January 1916, 118 followed in August, 120-121 in September. 122 made 37 years before it arrived at the ferro-knackers in July 1919. 117 reached 43 years before its dismantling in July 1925.
Data from T&P 1 - 1922 & T&P 1950ca Locomotive Diagrams supplied in May 2005 by Allen Stanley from his extensive Rail Data Exchange.
One notable feature of this design was the widely spread drivers, which allowed a long, narrow firebox to be fit between the frames and the axles. The last of the class was dismantled in January 1926.
Principal Dimensions by Steve Llanso of Middle Run Media | ||
---|---|---|
Class | A-2 | A-4 |
Locobase ID | 8495 | 8496 |
Railroad | New Orleans Pacific (T&P) | Texas & Pacific (T&P) |
Country | USA | USA |
Whyte | 4-4-0 | 4-4-0 |
Number in Class | 6 | 3 |
Road Numbers | 117-123/542-547/117-123 | 186-188 |
Gauge | Std | Std |
Number Built | 6 | 3 |
Builder | Danforth, Cooke | New York |
Year | 1882 | 1887 |
Valve Gear | Stephenson | Stephenson |
Locomotive Length and Weight | ||
Driver Wheelbase (ft / m) | 8 / 2.44 | 9.37 / 2.86 |
Engine Wheelbase (ft / m) | 21.83 / 6.65 | 23.73 / 7.23 |
Ratio of driving wheelbase to overall engine wheelbase | 0.37 | 0.39 |
Overall Wheelbase (engine & tender) (ft / m) | 46.12 / 14.06 | 48.58 / 14.81 |
Axle Loading (Maximum Weight per Axle) (lbs / kg) | ||
Weight on Drivers (lbs / kg) | 47,000 / 21,319 | 60,500 / 27,442 |
Engine Weight (lbs / kg) | 75,000 / 34,019 | 95,000 / 43,091 |
Tender Loaded Weight (lbs / kg) | 65,000 / 29,484 | 70,000 / 31,752 |
Total Engine and Tender Weight (lbs / kg) | 140,000 / 63,503 | 165,000 / 74,843 |
Tender Water Capacity (gals / ML) | 4000 / 15.15 | 4500 / 17.05 |
Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT) | 1500 / 5678 | 1800 / 6813 |
Minimum weight of rail (calculated) (lb/yd / kg/m) | 39 / 19.50 | 50 / 25 |
Geometry Relating to Tractive Effort | ||
Driver Diameter (in / mm) | 63 / 1600 | 63 / 1600 |
Boiler Pressure (psi / kPa) | 145 / 1000 | 150 / 1030 |
High Pressure Cylinders (dia x stroke) (in / mm) | 16" x 24" / 406x610 | 18" x 24" / 457x610 |
Tractive Effort (lbs / kg) | 12,020 / 5452.19 | 15,737 / 7138.19 |
Factor of Adhesion (Weight on Drivers/Tractive Effort) | 3.91 | 3.84 |
Heating Ability | ||
Tubes (number - dia) (in / mm) | 160 - 2" / 51 | 200 - 2" / 51 |
Flues (number - dia) (in / mm) | ||
Flue/Tube length (ft / m) | 10.83 / 3.30 | 11 / 3.35 |
Firebox Area (sq ft / m2) | 100 / 9.29 | 155 / 14.40 |
Grate Area (sq ft / m2) | 16 / 1.49 | 18 / 1.67 |
Evaporative Heating Surface (sq ft / m2) | 1005 / 93.40 | 1305 / 121.28 |
Superheating Surface (sq ft / m2) | ||
Combined Heating Surface (sq ft / m2) | 1005 / 93.40 | 1305 / 121.28 |
Evaporative Heating Surface/Cylinder Volume | 179.79 | 184.58 |
Computations Relating to Power Output (More Information) | ||
Robert LeMassena's Power Computation | 2320 | 2700 |
Same as above plus superheater percentage | 2320 | 2700 |
Same as above but substitute firebox area for grate area | 14,500 | 23,250 |
Power L1 | 4099 | 4634 |
Power MT | 384.54 | 337.73 |