Trains.com

gp50t

6765 views
34 replies
1 rating 2 rating 3 rating 4 rating 5 rating
  • Member since
    September 2003
  • 17,660 posts
Posted by Overmod on Monday, May 31, 2021 11:32 AM

Stupid question: could these fan motors operate reliably if inclined slightly?  Unless I misunderstand how the fans are located relative to the access doors, I would think there's enough room with ducts above and below the fans to angle the forward one slightly even with 'obtrusion' into the intake space at the front.

Are there good available drawings that show the arrangement, or pictures with the fan inspection doors open?

  • Member since
    April 2007
  • From: Palos Park, IL
  • 173 posts
Posted by bogie_engineer on Monday, May 31, 2021 10:40 AM

DanRaitz

Not necessarily, by doing a quick and dirty (eye-ball) check of Athearn's BB SD40T-2 and GP50, the radiator sections are the same length.  So, you could feasibly take the radiator section of the SD40T-2 and graft it onto the GP50 with no increase in length.

 

As I said, I believe it was the same length, however, it's not the radiators that would drive the length, it's fitting two cooling fans below the radiators between the air compressor and the rear sandbox while not obstructing the forward fan inlet too severely. The cooling system consists of two parallel sets of 3 double length radiator cores (54" long, 30" wide, 6 tube rows deep) with the fans biased to the rear two double length cores which may make the forward core less effective - the fans need to be as far from the radiators as possible to make full use of the core length. No doubt the cooling system engineer would have made a physical mock-up and tested it to insure design performance if an order materialized, but that never happened.

Dave

  • Member since
    September 2002
  • From: Maricopa, AZ
  • 214 posts
Posted by DanRaitz on Monday, May 31, 2021 10:13 AM

Not necessarily, by doing a quick and dirty (eye-ball) check of Athearn's BB SD40T-2 and GP50, the radiator sections are the same length.  So, you could feasibly take the radiator section of the SD40T-2 and graft it onto the GP50 with no increase in length.

 

If women don't find you handsome, they should at least find you handy .... Red Green
  • Member since
    April 2007
  • From: Palos Park, IL
  • 173 posts
Posted by bogie_engineer on Saturday, May 29, 2021 10:38 AM

IA and eastern

Would the GP50T have been longer than a regular GP50. Gary

 

I pretty sure it was to be the same length as a standard GP50 but I don't have copy of the general arrangement drawing to know positively, at most it would have 37' truck spacing - we always avoided anything closer to 39' to avoid lining up with rail joint spacing. I do recall it was to have two 48" cooling fans similar to an SD40T-2 which the higher fan speed tied to 950 rpm engine speed made work. It had a standard 3 cyl water cooled compressor in the normal location to the rear of the equipment rack with a curved shroud over it to keep it inside the engine compartment.

Dave 

  • Member since
    September 2003
  • 17,660 posts
Posted by Overmod on Saturday, May 29, 2021 7:43 AM

This is PLI 92061.  I think Dave Goding will have specific information on this.

  • Member since
    May 2011
  • 130 posts
gp50t
Posted by IA and eastern on Saturday, May 29, 2021 2:24 AM

Would the GP50T have been longer than a regular GP50. Gary

Join our Community!

Our community is FREE to join. To participate you must either login or register for an account.

Search the Community

Newsletter Sign-Up

By signing up you may also receive occasional reader surveys and special offers from Trains magazine.Please view our privacy policy