Western Pacific class TP-29
United States 1908 36 produced
The first 16 of these oil-fired ten-wheelers were delivered to the Western Pacific in 1908, followed by 20 more the following year. ALCO-Brooks asked for a price of between 13,247 and 14,585 dollars per locomotive. These locomotives opened passenger service through the Feather River Canyon in 1910. They were soon retrofitted with superheaters. Most were retired in the thirties or fourties. The 94 was in service until 1953, featured at the Western Pacific 50th anniversary celebrations, and pulled excursion trains from 1979 to 1986.
Technical data
General
| Property | as built | superheated |
|---|---|---|
| Built | 1908-1909 | 1909 |
| Manufacturers | ALCO | |
| Wheel arrangement | 4-6-0 (Ten-wheeler) | |
| Gauge | 1,435 mm (Standard gauge) | |
Dimensions and weights
| Property | as built | superheated |
|---|---|---|
| Wheelbase | 7.42 m | |
| Total wheelbase | 17.65 m | |
| Service mass | 82.1 t | |
| Adhesion mass | 61.2 t | |
| Total mass | 139.9 t | 142 t |
| Rigid wheelbase | 4.12 m | |
| Axle load | 20.4 t | |
| Water capacity | 22,712 l | 26,498 l |
| Fuel capacity | 11,621 l (oil) | 11,428 l (oil) |
Boiler
| Property | as built | superheated |
|---|---|---|
| Grate area | 3.112 m² | 3.122 m² |
| Firebox surface | 17.93 m² | 21.182 m² |
| Tube heating surface | 223.339 m² | 187.386 m² |
| Evaporative heating surface | 241.269 m² | 208.568 m² |
| Total heating surface | 241.3 m² | 261.3 m² |
| Superheater surface | 52.769 m² |
Power plant
| Property | as built | superheated |
|---|---|---|
| Driver diameter | 1,702 mm | |
| Boiler pressure | 13.8 bar | |
| Expansion type | simple expansion | |
| Cylinders | two, 533 x 660 mm | |
Power
| Property | as built | superheated |
|---|---|---|
| Power source | steam | |
| Estimated power | 746 kW (1,014 PS) | 1,044 kW (1,419 PS) |
| Starting effort | 129.4 kN | |
Calculated values
| Property | as built | superheated |
|---|---|---|
| Factor of adhesion | 1 : 4.64 | |
| Optimal speed | 35 km/h | 50 km/h |
| Power-to-weight ratio | 9.1 kW/t | 12.7 kW/t |
| Heating Surface Equivalent | 330.9 m² | 420.0 m² |
| Cylinder volume/HSE | 1 : 891.89 | 1 : 702.70 |
| Adhesive weight/Total | 1 : 1.34 | |
| Tractive force/Heating surface | 1 : 11.20 | 1 : 10.34 |
| Grate area/Heating surface | 1 : 77.53 | 1 : 83.71 |
| Firebox/Tube surface | 1 : 12.46 | 1 : 8.85 |
| Total/Superheater | 1 : 3.95 | |
