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Re: SD-40 verse SD-40-2 Question?
Author: SP5103
Date: 05-03-2012 - 11:08

At speeds around 10 mph, the SD45(-2) derated to 3000 hp to stay within adhesion limits of the era. So in reality, an SD45 did not have any more drag tractive effort than a SD40(-2). Once you typically got around 15-20 mph, their was no real advantage in an SD compared to the same GP design. The extra 600 hp of a 45 just allowed them to move a train a little faster at speed. But if you ran a "fast" railroad, there was no real advantage considering the cost of an SD45(-2) compared to a typical GP40(-2).

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Subject Written By Date/Time (PST)
  SD-40 verse SD-40-2 Question? Peter D. 05-01-2012 - 01:02
  Re: SD-40 verse SD-40-2 Question? J 05-01-2012 - 05:27
  Re: SD-40 verse SD-40-2 Question??Got It... Peter D. 05-01-2012 - 07:05
  Re: SD-40 verse SD-40-2 Question? SP5103 05-01-2012 - 07:09
  Re: SD-40 verse SD-40-2 Question? Rich Hunn 05-01-2012 - 09:16
  Re: SD-40 verse SD-40-2 Question? Pdxrailtransit 05-01-2012 - 10:10
  SD40-2 Radiator Comparison Pdxrailtransit 05-01-2012 - 11:43
  SD40-2 Radiator Grill Style Changeover Pdxrailtransit 05-01-2012 - 13:02
  Re: SD-40 verse SD-40-2 Question? E 05-01-2012 - 11:58
  Re: SD-40 verse SD-40-2 Question? SSS 05-01-2012 - 23:11
  Re: SD-40 verse SD-40-2 Question? Craig Tambo 05-02-2012 - 01:24
  Re: SD-40 verse SD-40-2 Question? George Andrews 05-02-2012 - 17:40
  Re: SD-40 verse SD-40-2 Question? SP5103 05-03-2012 - 11:08
  Re: SD-40 verse SD-40-2 Question? blimphangar 05-09-2012 - 23:52


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