4-8-8-4 locomotives were owned exclusively by the Union Pacific. Rumored to be named the âWasatchâ class, they acquired the name âBig Boyâ after an ALCO factory worked scrawled the text on the first unitâs smokebox during construction. They ran from 1941 to 1959.
N GEN 4-8-8-4 'Big Boy' Locomotive, UP #4020 Video Overview
4-8-8-4 locomotives were owned exclusively by the Union Pacific. Rumored to be named the âWasatchâ class, they acquired the name âBig Boyâ after an ALCO factory worked scrawled the text on the first unitâs smokebox during construction. They ran from 1941 to 1959.