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Informations concernant la
locomotive réele
Les pentes raides du tronçon séparant Ogden / Utah
de Cheyenne / Wyoming, avec une grimpée allant
jusqu’à 17,7 ‰, mirent l’Union Pacific à rude épreuve
à la fin des années 30. Il fallut accoupler jusqu’à
4 locomotives à vapeur l’une derrière l’autre pour
arriver à tirer les lourds wagons de marchandises
sur ce trajet montagneux.
C’est la raison pour laquelle l’American Locomotive
Corporation reçut l’ordre de concevoir une locomotive
à vapeur capable de tirer toute seule les trains lourds
de 3600 tonnes sur ce parcours. C’est ainsi que
naquit la «Classe 4000», mise en service en 1941,
qui se fit une réputation dans le monde entier sous
son surnom de «Big Boy». Avec ses performances
et ses dimensions, cette locomotive avec disposition
d’essieux 4-8-8-4 éclipsa tout ce que l’on n’avait
jamais vu jusqu’à présent et resta jusqu’à aujourd’hui
la locomotive à vapeur la plus grosse du monde.
Caractéristiques techniques:
Longueur totale de la locomotive: 40,51 m
Poids total: 540 t
Puissance: 5884 kW (7000 PS)
Vitesse de croisière: 64 km/h
Informatie van het voorbeeld
De steile berghellingen met tot wel 17,7 ‰ steiging
op het traject tussen Ogden / Utah en Cheyenne /
Wyoming noopten de spoormaatschappij Union
Pacific eind jaren dertig tot een bijzonder hoge inzet
van mensen en materieel. Zo’n vier stoomlocomo-
tieven moesten achter elkaar gekoppeld worden, om
de zware goederentreinen op dit traject te kunnen
trekken.
Om die reden werd de American Locomotive Corpo-
ration met de bouw van een stoomlocomotief belast,
die deze 3600 t zware treinen op het traject in zijn
eentje aan moest kunnen. Het resultaat was de in
1941 in dienst gestelde Class 4000, die onder zijn
bijnaam „Big Boy” wereldwijd bekend werd.
Met haar prestaties en afmetingen stelde deze loc
met de asindeling 4-8-8-4 alles wat er tot dan toe
gebouwd was in de schaduw en bleef tot op heden
de grootste stoomlocomotief ter wereld.
Technische gegevens:
Totale lengte van de loc: 40,51 m
Totaal gewicht: 540 t
Vermogen: 5884 kW (7000 PK)
Reissnelheid: 64 km/u
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