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Erie classes S-1 to S-4

S-4 No. 3397 in August 1936

The Erie was the American railroad that ordered the greatest number of 2-8-4 “Berkshire” locomotives. These 105 locomotives were not only delivered by all three major manufacturers, but also had the biggest heating su...

General

Property	Erie classes S-1 to S-4 S-4 S-1 S-2 S-3 S-4 Remove
Built	1929
Manufacturers	Lima
Wheel arrangement	2-8-4 (Berkshire)
Gauge	1,435 mm (Standard gauge)

Dimensions and weights

Property	Erie classes S-1 to S-4 S-4 S-1 S-2 S-3 S-4 Remove
Wheelbase	13.41 m
Rigid wheelbase	5.56 m
Total wheelbase	27.90 m
Service weight	212.6 t
Adhesive weight	130 t
Axle load	32.7 t
Total weight	384 t
Water capacity	78,737 l
Fuel capacity	25.4 t (coal)

Boiler

Property	Erie classes S-1 to S-4 S-4 S-1 S-2 S-3 S-4 Remove
Grate area	9.29 m²
Firebox surface	41.714 m²
Tube heating surface	487.37 m²
Evaporative heating surface	529.083 m²
Superheater surface	236.438 m²
Total heating surface	765.5 m²

Power plant

Property	Erie classes S-1 to S-4 S-4 S-1 S-2 S-3 S-4 Remove
Driver diameter	1,778 mm
Boiler pressure	17.2 bar
Expansion type	simple expansion
Cylinders	two, 724 x 813 mm

Power

Property	Erie classes S-1 to S-4 S-4 S-1 S-2 S-3 S-4 Remove
Power source	steam
Estimated power	3,803 kW (5,171 PS)
Starting effort	351.0 kN

Calculated values

Property	Erie classes S-1 to S-4 S-4 S-1 S-2 S-3 S-4 Remove
Factor of adhesion	1 : 3.63
Optimal speed	66 km/h
Power-to-weight ratio	17.9 kW/t
Heating Surface Equivalent	1,210.5 m²
Cylinder volume/HSE	1 : 552.69
Adhesive weight/Total	1 : 1.64
Tractive force/Heating surface	1 : 9.58
Grate area/Heating surface	1 : 82.40
Firebox/Tube surface	1 : 11.68
Total/Superheater	1 : 2.24

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