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Dynamic Brake "Blisters"

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  • Member since
    February 2009
  • From: Orlando, Florida
  • 93 posts
Posted by The Railwolf on Friday, October 9, 2009 10:22 PM

 On GP/SD50-up, the dynamic brake fan is hard to spot unless you're higher than eye-level with the roof: It's just behind the cab and somewhat recessed.

  • Member since
    July 2006
  • From: Central New York
  • 335 posts
Posted by MJChittick on Friday, October 9, 2009 10:03 PM
bubbajustin

So for example on a SD50,

The three big fans on the far end are the Dynamic break fans

No, the three large fans at the rear of the SD50 long hood are the radiator fans.  The dynamic brake resistor grids are located immediately behind the cab and in front of the central air intake.

Mike

  • Member since
    January 2009
  • From: Norfolk Southern Lafayette District
  • 1,642 posts
Posted by bubbajustin on Friday, October 9, 2009 8:14 PM

So for example on a SD50,

The three big fans on the far end are the Dynamic break fans, and the 2 up front are what, the air intake for the engine?

The road to to success is always under construction. _____________________________________________________________________________ When the going gets tough, the tough use duct tape.

  • Member since
    December 2001
  • From: NW Wisconsin
  • 3,857 posts
Posted by beaulieu on Friday, October 9, 2009 12:52 AM

cx500

BamaCSX83

I know this might have been asked before, but I'm going to ask it again since I can't find any evidence of it being asked.  What ever happened to the "classic" EMD dynamic brake blister found on engines up to the SD40 and/or SD40-2?  I'm going to guess that as the dynamic resistors got better, they probably got smaller, which meant that EMD could move the dynamics into an area forward of the air inlet and get rid of the blister found on earlier units.  If anyone could help me out on this one, it would be great. 

 

The blister went when the dynamic brake resistors and fan were moved to the end of the locomotive behind the radiators.  It results in a longer locomotive, but the grids are no longer sitting right above a hot engine.

John

 

Or right behind the cab for SD50/60s. The grids actually got bigger not smaller, the blisters were due to the location above the diesel engines and their exhaust manifolds.

  • Member since
    October 2008
  • From: Calgary
  • 2,047 posts
Posted by cx500 on Thursday, October 8, 2009 11:28 PM

BamaCSX83

I know this might have been asked before, but I'm going to ask it again since I can't find any evidence of it being asked.  What ever happened to the "classic" EMD dynamic brake blister found on engines up to the SD40 and/or SD40-2?  I'm going to guess that as the dynamic resistors got better, they probably got smaller, which meant that EMD could move the dynamics into an area forward of the air inlet and get rid of the blister found on earlier units.  If anyone could help me out on this one, it would be great. 

 

The blister went when the dynamic brake resistors and fan were moved to the end of the locomotive behind the radiators.  It results in a longer locomotive, but the grids are no longer sitting right above a hot engine.

John

  • Member since
    November 2008
  • From: Troy, AL
  • 724 posts
Dynamic Brake "Blisters"
Posted by BamaCSX83 on Thursday, October 8, 2009 8:45 PM

I know this might have been asked before, but I'm going to ask it again since I can't find any evidence of it being asked.  What ever happened to the "classic" EMD dynamic brake blister found on engines up to the SD40 and/or SD40-2?  I'm going to guess that as the dynamic resistors got better, they probably got smaller, which meant that EMD could move the dynamics into an area forward of the air inlet and get rid of the blister found on earlier units.  If anyone could help me out on this one, it would be great. 

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