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The reference for locomotives and railcars

Silver Falls Timber No. 103 and 104

United States 1922 2 produced
Both locomotives together at the Peninsula Terminal Company Martin E. Hansen collection

Locomotives No. 103 and 104 originally built for Silver Falls Lumber in Oregon were two 2-6-2ST saddle tanks which spent nearly all of their career together. While 103 was built in 1922 by Baldwin with works number 55482, 104 followed four years later with works number 59137. They were oil burners which carried a total of 1,800 gallons of water and 750 gallons of oil. The drivers had a diameter of 44 inches and the cylinders measured 17 inches in diameter and 24 inches in stroke. Weight in working order was 134,500 pounds of which 105,000 rested on the drivers.

When Silverton Mill closed in 1938, they were stored in this place and only went to a seller in Portland in 1949. Their new owner who kept their running numbers unchanged was the Peninsula Terminal Company. There they replaced two 0-6-0 in switching service in yards in west Portland. After they were withdrawn in 1966, they were bought by the Black Hills Central Railroad in South Dakota to haul tourist trains. 103 is currently waiting to be rebuilt and 104 has been finally retired in 2019.

No. 104 at the Black Hills Central RRpictureArchives.net / William Rogerson

Technical data

General

Built
1922, 1926
Manufacturers
Baldwin
Wheel arrangement
2-6-2ST (Prairie)
Gauge
1,435 mm (Standard gauge)

Dimensions and weights

Wheelbase
7.70 m
Service mass
61 t
Adhesion mass
47.6 t
Rigid wheelbase
2.90 m
Axle load
15.9 t
Water capacity
6,814 l
Fuel capacity
2,839 l (oil)

Boiler

Grate area
1.514 m²
Firebox surface
6.875 m²
Tube heating surface
67.819 m²
Evaporative heating surface
74.694 m²
Superheater surface
17.466 m²
Total heating surface
92.2 m²

Power plant

Driver diameter
1,118 mm
Boiler pressure
11.4 bar
Expansion type
simple expansion
Cylinders
two, 432 x 610 mm

Power

Power source
steam
Estimated power
410 kW (557 PS)
Starting effort
98.3 kN

Calculated values

Factor of adhesion
1 : 4.75
Optimal speed
26 km/h
Power-to-weight ratio
6.7 kW/t
Heating Surface Equivalent
144.0 m²
Cylinder volume/HSE
1 : 1,239.84
Adhesive weight/Total
1 : 1.28
Tractive force/Heating surface
1 : 22.29
Grate area/Heating surface
1 : 60.87
Firebox/Tube surface
1 : 9.86
Total/Superheater
1 : 4.28
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