Frisco Lines class 4200
United States 1930 20 produced
The last and heaviest Mikados built for the Frisco were the 20 locomotives numbered 4200 to 4219. Like most of their predecessors, they had drivers of 63 inches and cylinders of 27 by 32 inches. At a boiler pressure of 235 psi, they delivered a starting tractive effort of 73,965 pounds and a trailing truck booster added another 9,600 pounds. They had a mechanical stoker, a coffin feed water heater, two thermic syphons and arch tubes. They were retired between 1953 and 1956.
Technical data
General
- Built
- 1930
- Manufacturers
- Baldwin
- Wheel arrangement
- 2-8-2 (Mikado)
- Gauge
- 1,435 mm (Standard gauge)
Dimensions and weights
- Wheelbase
- 11.46 m
- Service mass
- 170.5 t
- Adhesion mass
- 124.6 t
- Total mass
- 276.1 t
- Rigid wheelbase
- 5.13 m
- Axle load
- 31.2 t
- Water capacity
- 45,425 l
- Fuel capacity
- 15.4 t (coal)
Boiler
- Grate area
- 7.46 m²
- Firebox surface
- 36.232 m²
- Tube heating surface
- 371.055 m²
- Evaporative heating surface
- 407.287 m²
- Superheater surface
- 178.374 m²
- Total heating surface
- 585.7 m²
Power plant
- Driver diameter
- 1,600 mm
- Boiler pressure
- 16.2 bar
- Expansion type
- simple expansion
- Cylinders
- two, 686 x 813 mm
Power
- Power source
- steam
- Estimated power
- 2,983 kW (4,056 PS)
- Starting effort
- 329.0 kN
- Starting effort booster
- 42.703 kN
Calculated values
- Factor of adhesion
- 1 : 3.72
- Optimal speed
- 55 km/h
- Power-to-weight ratio
- 17.5 kW/t
- Heating Surface Equivalent
- 945.2 m²
- Cylinder volume/HSE
- 1 : 635.30
- Adhesive weight/Total
- 1 : 1.37
- Tractive force/Heating surface
- 1 : 11.73
- Grate area/Heating surface
- 1 : 78.51
- Firebox/Tube surface
- 1 : 10.24
- Total/Superheater
- 1 : 2.28
