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The reference for locomotives and railcars

Sugar Pine Lumber Co. No. 5 “Minaret”

United States 1927 1 produced
During its time as Consolidated Builders No. 800 www.bigbendrailroadhistory.com

The Sugar Pine Lumber Co., founded in 1923, was a logging railroad in the Sierra Nevada in California that called itself the “crookedest railroad ever built”. Nevertheless, they used locomotives with multiple driving axles in one frame. This started with four 2-8-2 saddle tank locomotives built by ALCO. In need for even more power, they even ordered a 2-10-2 saddle tank in 1927.

Given the number 5 and called “Minaret”, it must have been the heaviest saddle tank locomotive ever and most likely also the only 2-10-2ST. After the SPL shut down its operations in 1935, No. 5 was used by several construction contractors. One was the Mason-Walsh-Atkinson-Kier & Co., which used in in the construction of the Grand Coulee Dam and added an additional tender. The last operator was H. J. Kaiser Co., which scrapped it in 1947.

Technical data

General

Built
1927
Manufacturers
ALCO
Wheel arrangement
2-10-2ST (Santa Fé)
Gauge
1,435 mm (Standard gauge)

Dimensions and weights

Wheelbase
10.74 m
Service mass
121.3 t
Adhesion mass
96.6 t
Rigid wheelbase
5.79 m
Axle load
19.3 t
Water capacity
15,142 l

Boiler

Grate area
3.112 m²
Evaporative heating surface
224.361 m²
Superheater surface
54.627 m²
Total heating surface
279.0 m²

Power plant

Driver diameter
1,219 mm
Boiler pressure
15.2 bar
Expansion type
simple expansion
Cylinders
two, 559 x 711 mm

Power

Power source
steam
Estimated power
969 kW (1,317 PS)
Starting effort
234.8 kN

Calculated values

Factor of adhesion
1 : 4.04
Optimal speed
26 km/h
Power-to-weight ratio
8.0 kW/t
Adhesive weight/Total
1 : 1.26
Tractive force/Heating surface
1 : 17.58
Grate area/Heating surface
1 : 89.65
Total/Superheater
1 : 4.11
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