Dash 2

On January 1, 1972, General Motors' Electro-Motive Division (EMD) introduced its new Dash 2 line of diesel-electric locomotives. All designations of these new models were those of the former models with "-2" added (e.g., the SD40 was replaced by the SD40-2). They all retained the basic specifications of the earlier models in terms of power output and most other features, but introduced a large number of improvements to the locomotives' internal systems, specifically the electrical systems. These were intended to improve availability, efficiency, and ease of maintenance.
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