Illinois Central class 1139
United States 1916 65 produced
The class 1139 of the Illinois Central consisted of 65 Pacifics which came after the 70 class 1069 locomotives from 1910. They had 75 inch drivers and 26 by 28 inch cylinders. 20 each were delivered in 1916 and 1918 by ALCO-Brooks and 25 more in 1920 by ALCO-Schenectady. The specs in the table are for the 25 last locomotives which had two fewer tubes and a heating area that was 20 square feet smaller compared to the first 40. In the forties, they received disc wheels for the main driving axle and the air compressors have been relocated.
Technical data
General
- Built
- 1916, 1918, 1920
- Manufacturers
- ALCO
- Wheel arrangement
- 4-6-2 (Pacific)
- Gauge
- 1,435 mm (Standard gauge)
Dimensions and weights
- Wheelbase
- 10.47 m
- Total wheelbase
- 20.43 m
- Service mass
- 127 t
- Adhesion mass
- 76.9 t
- Total mass
- 209.7 t
- Rigid wheelbase
- 3.96 m
- Axle load
- 25.6 t
- Water capacity
- 34,069 l
- Fuel capacity
- 13.6 t (coal)
Boiler
- Grate area
- 5.11 m²
- Firebox surface
- 22.687 m²
- Tube heating surface
- 314.087 m²
- Evaporative heating surface
- 336.774 m²
- Superheater surface
- 76.738 m²
- Total heating surface
- 413.5 m²
Power plant
- Driver diameter
- 1,905 mm
- Boiler pressure
- 13.1 bar
- Expansion type
- simple expansion
- Cylinders
- two, 660 x 711 mm
Power
- Power source
- steam
- Estimated power
- 1,529 kW (2,079 PS)
- Starting effort
- 181.3 kN
Calculated values
- Factor of adhesion
- 1 : 4.16
- Optimal speed
- 51 km/h
- Power-to-weight ratio
- 12.0 kW/t
- Heating Surface Equivalent
- 603.7 m²
- Cylinder volume/HSE
- 1 : 807.08
- Adhesive weight/Total
- 1 : 1.65
- Tractive force/Heating surface
- 1 : 9.16
- Grate area/Heating surface
- 1 : 80.92
- Firebox/Tube surface
- 1 : 13.84
- Total/Superheater
- 1 : 4.39
