Milwaukee Road Class EP-2 electrics

from AmericanRails.com:

The Milwaukee Road’s Class EP-2 electric locomotives, commonly known as Bipolars, were one of the most interesting designs ever developed.

Arriving just a few years after the EP-1s, the Bipolars built exclusively for passenger service, were another collaboration from General Electric and the American Locomotive Company (Alco).

Not only was this design one of the most interesting ever built it was also one of the most complex, made up of no less than three articulated sections.

After about 40 years of service the EP-2s were pulled from daily use in the late 1950s, largely due to an overhaul issue. In spite of this, they were highly reliable locomotives that enjoyed several decades of service.

General Electric did not enter diesel locomotive production until the late 1950's. However, the company had been building or collaborating on electric propulsion since the late 19th century and produced some very fine designs during that time.

Wikipedia article