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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-2 S-1 S-2 S-3 S-4 Remove
Built	1927
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-2 S-1 S-2 S-3 S-4 Remove
Wheelbase	13.41 m
Rigid wheelbase	5.56 m
Total wheelbase	26.39 m
Service weight	207.5 t
Adhesive weight	127.5 t
Axle load	32.1 t
Total weight	357.2 t
Water capacity	62,459 l
Fuel capacity	21.8 t (coal)

Boiler

Property	Erie classes S-1 to S-4 S-2 S-1 S-2 S-3 S-4 Remove
Grate area	9.29 m²
Firebox surface	41.621 m²
Tube heating surface	487.649 m²
Evaporative heating surface	529.269 m²
Superheater surface	230.4 m²
Total heating surface	759.7 m²

Power plant

Property	Erie classes S-1 to S-4 S-2 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-2 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-2 S-1 S-2 S-3 S-4 Remove
Factor of adhesion	1 : 3.56
Optimal speed	66 km/h
Power-to-weight ratio	18.3 kW/t
Heating Surface Equivalent	1,198.2 m²
Cylinder volume/HSE	1 : 558.39
Adhesive weight/Total	1 : 1.63
Tractive force/Heating surface	1 : 9.65
Grate area/Heating surface	1 : 81.77
Firebox/Tube surface	1 : 11.72
Total/Superheater	1 : 2.30

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