1910 Southern Pacific Railroad
NO. 4102 4-8-8-2
WHILE THIS is not the original "cab-ahead" engine, it
was one of the earlier ones. The principal reason for this cab
location was the 38-mile series of snowsheds between Truckee and
Blue Canyon built to keep the line open in winter when drifts
of fifty to two hundred feet deep piled up in the passes. When
the 4000 and 4001 were operated through these snowsheds, their
crews were all too frequently overcome by the gases. The new design
was developed to overcome this objection as well as to increase
visibility. Fuel oil was piped the length of the engine at five
pounds pressure from the tender, and locomotive and tender positions
were reversed, thus creating this cab-ahead type. Fifteen engines
constituted the original order and these were compounds. In recent
years the S.P. had a fleet of over two hundred such power, although
all were single expansion locomotives, conversions of the older
engines having been started in 1927.
FIRST CAB-AHEAD TYPEAC1
Builder-Baldwin Locomotive Works
Cylinders-22" x 30" (rebuilt simple)
Weight, engine-481,200 lb.
Steam Pressure-210 lb.
Fuel-3,817 gal. oil
Water-12,000 gal.
Dia. Drivers-57"
Tractive Effort-90,940 lb.
LOCOMOTIVE ILLUSTRATEDAC4
Builder-Baldwin Locomotive Works
Cylinders-24" x 32" (simple)
Weight, engine-614,000 lb.
Steam pressure-235 lb.
Fuel-4,889 gal. oil
Water-16,152 gal.
Dia. Drivers-63"
Tractive Effort-116,900 lb.
They
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