EMC demonstrator #511 on the CB&Q in 1937. The locomotive is painted silver, to serve as a backup for CB&Q's EMC-built Zephyr power cars. Photo by Otto Perry.

EMC Demonstrators No. 511 and 512.

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EMC demonstrator No. 511 on the CB&Q in 1937. The locomotive is painted silver, to serve as a backup for CB&Q's EMC-built Zephyr power cars.

Photo by Otto Perry.    "EMD 511" by Otto Perry - http://digital.denverlibrary.org/cdm/ref/collection/p15330coll22/id/52003. Licensed under Fair use via Wikipedia - https://en.wikipedia.org/wiki/File:EMD_511.jpg#/media/File:EMD_511.jpg

EMC Demonstrators No. 511 and 512.

EMC demonstrators 511 and 512 - 1800 HP B-B Diesel Locomotives

Electro-Motive Corporation (later Electro-Motive Division, General Motors) produced five 1800 hp B-B experimental passenger train-hauling Diesel locomotives in 1935; two company-owned demonstrators, No. 511 and No. 512, the Baltimore and Ohio Railroad's No. 50, and two units for the Atchison, Topeka and Santa Fe Railway, Diesel Locomotive No. 1. In addition, two single power cars and two twin-unit power cars for the Chicago, Burlington and Quincy Railroad's Zephyr streamliners were built to fundamentally the same design, but clad in Budd Company streamlined stainless steel carbodies. These were No. 9904 Pegasus and No. 9905 Zephyrus for the Twin Zephyrs, and No. 9906A/B Silver King/Silver Queen and No. 9907A/B Silver Knight/Silver Princess for the Denver Zephyrs.

All were the mechanical ancestors to EMD's successful E-units, with identical pairs of 900 hp Winton 201-A Diesel engines, although they ran on AAR type B two-axle trucks instead of the A1A trucks of E-units. When delivered, the units were fitted with shrouding around their trucks, but this did not last long.

The boxy carbodies of all but the Zephyrs were the work of GE's Erie, Pennsylvania works, EMD having not yet developed the ability to produce their own bodywork. Like most boxcabs, they had control cabs at both ends, a feature that would only rarely be repeated in future North American locomotives, although it would become common elsewhere.

EMC demonstrators 511 and 512
The two EMC demonstrators, numbered 511 and 512, were built in May 1935 to demonstrate the future of passenger Diesel power to potential customers. The boxy bodywork was not what EMC intended to sell, but it was an easy way to demonstrate the power units and hauling capacity, which would not be changed in the future E-units.

They were demonstrated both together and singly; the latter for shorter trains for local and less busy services, the former to replace larger steam locomotives on busy trains.

EMC No. 512, painted silver, served as Unit C of ATSF locomotive No. 1, and helped pull the first regular run of the new streamlined, Budd-built Super Chief on May 18, 1937.

In 1938, having outlived their usefulness, the two demonstrators were scrapped. Trucks and some other components were re-used for the two NW4 switchers built for the Missouri Pacific Railroad.

Type and origin
Power type: Diesel-electric
Builder: Electro-Motive Corporation
Serial number: 511–512
Build date: August 1935
Total produced: 2
Specifications
Career

Numbers: 511–512
Official name: 1800 hp B-B
Locale: North America
Disposition: Scrapped

See also:

EMC-EMD

EMC-EMD Diesel-Electric Locomotives

Diesel-Electric Locomotives

Locomotives

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A Burlington Zephyr and EMC Demonstrator No. 511 with passenger train, circa 1935-37.

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A Burlington Zephyr and EMC Demonstrator No. 511 with passenger train, circa 1935-37.