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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...

	Erie classes S-1 to S-4 Remove
Variant	S-1 S-1 S-2 S-3 S-4
Built	1927
Manufacturers	ALCO
Wheel arrangement	1D2
Gauge	1435 mm
Length
Service mass	200942 kg
Top speed
Power
Engine

General

Property	Erie classes S-1 to S-4 S-1 S-1 S-2 S-3 S-4 Remove
Built	1927
Manufacturers	ALCO
Wheel arrangement	2-8-4 (Berkshire)
Gauge	1,435 mm

Dimensions and weights

Property	Erie classes S-1 to S-4 S-1 S-1 S-2 S-3 S-4 Remove
Wheelbase	12.80 m
Total wheelbase	26.26 m
Service mass	200.9 t
Adhesion mass	125.2 t
Total mass	341.6 t
Rigid wheelbase	5.56 m
Axle load	32.2 t
Water capacity	62,459 l
Fuel capacity	21.8 t (coal)

Boiler

Property	Erie classes S-1 to S-4 S-1 S-1 S-2 S-3 S-4 Remove
Grate area	9.29 m²
Firebox surface	41.714 m²
Tube heating surface	487.741 m²
Evaporative heating surface	529.455 m²
Superheater surface	227.427 m²
Total heating surface	756.9 m²

Power plant

Property	Erie classes S-1 to S-4 S-1 S-1 S-2 S-3 S-4 Remove
Driver diameter	1,778 mm
Boiler pressure	15.5 bar
Expansion type	simple expansion
Cylinders	two, 724 x 813 mm

Power

Property	Erie classes S-1 to S-4 S-1 S-1 S-2 S-3 S-4 Remove
Power source	steam
Estimated power	3,579 kW (4,866 PS)
Starting effort	315.9 kN

Calculated values

Property	Erie classes S-1 to S-4 S-1 S-1 S-2 S-3 S-4 Remove
Factor of adhesion	1 : 3.89
Optimal speed	69 km/h
Power-to-weight ratio	17.8 kW/t
Heating Surface Equivalent	1,192.9 m²
Cylinder volume/HSE	1 : 560.87
Adhesive weight/Total	1 : 1.61
Tractive force/Heating surface	1 : 8.72
Grate area/Heating surface	1 : 81.47
Firebox/Tube surface	1 : 11.69
Total/Superheater	1 : 2.33

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