EMD SW600 Phase Guide and Builder List

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 EMD's SW600 was the six-hundred horsepower successor to the SW1. Three new models were introduced in 1954 - the SW600, SW900, and SW1200.

EMD built 1,056 of their 1200-horsepower SW1200 model. The SW900, at 900 horsepower, sold reasonably well at 372. The customer base for that model was industry and a few Class I roads with light-duty branch line applications. But the little SW600? Just 15 units for 13 different customers with no repeat orders.

Six hundred horsepower units were a niche market by this time. Long gone were the robust sales of the SW1. Customers were few, mostly oil refiners, chemical plants, coal-fired electrical power plants, and rarely, a steel producer. 

The only Class I customer was Chicago & North Western, buying just two units.

By the time the 645-powered switchers were introduced, EMD could no longer justify including a six-hundred horsepower model because the margins were too low.

Here's a link to the .pdf.

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