|
The Chicago, Milwaukee, St. Paul and Pacific Railroad (Milwaukee Road) classes EP-1 and EF-1 comprised 42 boxcab electric locomotives built by the American Locomotive Company (ALCO) in 1915. Electrical components were from General Electric. The locomotives were composed of two half-units semi-permanently coupled back-to-back, and numbered as one unit with 'A' and 'B' suffixes. As built, 30 locomotives were assigned to freight service, classified as EF-1 and numbered 10200–10229. The remaining twelve locomotives were assigned to passenger service as class EP-1, numbered 10100–10111, with higher-speed passenger gearing. The design was highly successful, replacing a much larger number of steam locomotives, cutting costs and improving schedules. In 1919, with the arrival of a newer generation of passenger power, the EP-1 locomotives were converted to EF-1 freight locomotives, and renumbered 10230–10241. In this role, they served until the 1950s, when the arrival of the Little Joe locomotives began to replace them in freight service. == Technical information == They were fitted with multiple-unit train control systems, and could thus be joined together into larger sets and operated from a single control station. They were also retrofitted with a special multiple unit control system designed by an electrical engineer of The Milwaukee Road. This enabled the crew of a Boxcab to control trailing diesel electric locomotives. However, the EF-4 "Little Joes", which were also retrofitted, were more often seen leading diesel electrics than Boxcabs, which had by then been largely relegated to the role of helper or bank engine. The maximum speed of an EF-1 as built was . Higher speeds led to excessive strain on the traction motor armatures. The rebuilding programme of the 1950s raised this to to help maintain faster schedules. The two powered trucks were connected together with a ball-and-socket joint, and the couplers were also attached to the trucks. The bodywork, therefore, did not take the load of the train. Each truck had outside bar frames, allowing more room for the traction motors and equipment. The front powered truck's frames extended forward and carried an outrigger truck and the heavy snowplows the units bore. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Milwaukee Road class EP-1, EF-1, EF-2, EF-3, and EF-5」の詳細全文を読む スポンサード リンク
|