Trix Big Boy Manual Del Usuario página 3

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Class 4000 "Big Boy"
The steep grades with inclines of up to 1.77 % on
the route between Ogden, Utah and Cheyenne,
Wyoming created considerable operating expenses
for the Union Pacific at the end of the 1930s. Up to
4 steam locomotives had to be coupled together in
tandem in order to pull the heavy freight trains along
this mountainous stretch of track.
An order was therefore placed with the American
Locomotive Corporation for a steam locomotive
capable of hauling these 3,600 ton locomotives
on its own along this route. The result was the
class 4000, placed into service in 1941 and soon
known around the world by its nickname of "Big Boy".
The performance and dimensions of this 4-8-8-4
locomotive left all previous motive power in the dust,
and the Big Boy is still the largest steam locomotive
in the world.
Specifications:
Total locomotive length: 40.51 m
Tender length:
Total weight:
Power:
Coal capacity:
Water capacity:
Top speed:
Normal speed:
/ 132 ft. 9-7/8''
13.90 m
/ 45 ft. 6 in.
540 t
/ 594 tons
5,884 kW / 7,000 hp
25.4 t
/ 28 tons
94.75 m
3
/ 25,000 gal.
112 km/h / 70 mph
64 km/h
/ 40 mph
3

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