New Haven class I-5
United States 1937 10 produced
In the mid-1930s, the New Haven had a requirement to haul a twelve-car (830 short tons) train at 60 mph (97 km/h) on a 0.6 to 0.7 percent grade. Since only 40 or 45 mph were allowed in many places in the New Haven network, good acceleration was also necessary. Due to the axle load being limited at the same time, a locomotive with a 4-6-4 wheel arrangement was developed for these requirements.
The ten class I-5 locomotives were the last new steam locomotives of the New Haven. They were the first in the US to have partial streamlined fairing that still allowed good accessibility for maintenance. The last I-5 class locomotive was retired in 1951.
Technical data
General
- Built
- 1937
- Manufacturers
- Baldwin
- Wheel arrangement
- 4-6-4 (Hudson)
- Gauge
- 1,435 mm (Standard gauge)
Dimensions and weights
- Length
- 29.57 m
- Wheelbase
- 12.22 m
- Total wheelbase
- 25.86 m
- Service mass
- 165.7 t
- Adhesion mass
- 87.5 t
- Total mass
- 316.3 t
- Rigid wheelbase
- 4.27 m
- Axle load
- 29.2 t
- Water capacity
- 68,137 l
- Fuel capacity
- 14.5 t (coal)
Boiler
- Grate area
- 7.17 m²
- Firebox surface
- 44.61 m²
- Tube heating surface
- 309.94 m²
- Evaporative heating surface
- 354.55 m²
- Superheater surface
- 96.84 m²
- Total heating surface
- 451.4 m²
Power plant
- Driver diameter
- 2,032 mm
- Boiler pressure
- 19.7 bar
- Expansion type
- simple expansion
- Cylinders
- two, 559 x 762 mm
Power
- Power source
- steam
- Estimated power
- 3,356 kW (4,563 PS)
- Starting effort
- 196.2 kN
Calculated values
- Factor of adhesion
- 1 : 4.38
- Optimal speed
- 105 km/h
- Power-to-weight ratio
- 20.3 kW/t
- Heating Surface Equivalent
- 771.3 m²
- Cylinder volume/HSE
- 1 : 484.94
- Adhesive weight/Total
- 1 : 1.89
- Tractive force/Heating surface
- 1 : 9.08
- Grate area/Heating surface
- 1 : 62.96
- Firebox/Tube surface
- 1 : 6.95
- Total/Superheater
- 1 : 3.66
