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December 8, 2009
La locomotora Big Boy Alco Serie 4,000. Solo operada por la Union Pacific y diseñada por Alco, con una potencia de 6,290cv a 67kmh y una velocidad maxima de 129kmh, fue la locomotora a vapor articulada mas grande construida, conocida como la locomotora Big Boy (Chico Grande).
The locomotive Big Boy Alco Series 4,000. Only operated by the Union Pacific and designed by Alco, with a power of 6,290hp@42mph top speed 80mph, was the steam locomotive articulated bigger built, know also as the locomotive Big Boy.