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The Chicago, Milwaukee, St. Paul and Pacific Railroad ( the Milwaukee Road ), the last transcontinental line to be built, electrified its lines across the Rocky Mountains and to the Pacific Ocean starting in 1915.
A few East Coast lines, notably the Virginian Railway and the Norfolk and Western Railway, found it expedient to electrify short sections of their mountain crossings.
However, by this point, electrification in the United States was more associated with dense urban traffic and the use of electric locomotives declined in the face of dieselization.
Diesels shared some of the electric locomotive ’ s advantages of over steam and the cost of building and maintaining the power supply infrastructure, which had always worked to discourage new installations, brought on the elimination of most mainline electrification outside the Northeast.
Except for a few captive systems ( e. g. the Black Mesa and Lake Powell ), by 2000 electrification was confined to the Northeast Corridor and some commuter service ; even there, freight service was handled by diesels.
The centre of development shifted to Europe, where electrification was widespread.

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