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Information about the Prototype
The steep ascents with inclines of up to 17.7 ‰ on
the route between Ogden / Utah and Cheyenne /
Wyoming put the Union Pacific to considerable ope-
rating expense at the end of the 1930s. Up to 4 steam
locomotives had to be coupled in line together in order
to pull the heavy goods trains along this mountainous
section of track.
The American Locomotive Corporation was therefore
charged with building a steam locomotive that could
convey these 3600-tonne trains along this route on
its own. The result was the Class 4000, taken into
service in 1941 and soon known across the world
under its nickname of “Big Boy”. With its performance
details and dimensions, this 4-8-8-4 axle locomotive
put everything before it in the shade and is still today
the largest steam engine in the world.
Specifications:
Total length of locomotive: 40.51 m
Total weight: 540 t
Output: 5884 kW (7000 PS)
Travelling speed: 64 km/h
Informationen zum Vorbild
Die steilen Rampen mit bis zu 17,7 ‰ Steigung auf
der Strecke zwischen Ogden / Utah und Cheyenne /
Wyoming stellte die Union Pacific Ende der 30er Jahre
vor einen besonders hohen Betriebsaufwand. Bis zu
4 Dampflokomotiven mussten hintereinander gekup-
pelt werden, um die schweren Güterzüge über diese
Gebirgsstrecke zu ziehen.
Daher wurde die American Locomotive Corporation
mit dem Bau einer Dampflokomotive beauftragt,
die diese 3600 t schweren Züge alleine über diese
Strecke befördern konnte. Das Ergebnis war die
1941 in Dienst gestellte Class 4000, die unter ihrem
Spitznamen „Big Boy“ weltweit bekannt wurde.
Mit ihren Leistungsdaten und ihren Abmessungen
stellte diese Lok mit der Achsfolge 4-8-8-4 alles
bisher dagewesene in den Schatten und blieb bis
heute die größte Dampflokomotive der Welt.
Technische Daten:
Gesamtlänge der Lok: 40,51 m
Gesamtgewicht: 540 t
Leistung: 5884 kW (7000 PS)
Reisegeschwindigkeit: 64 km/h
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