SD80MAC rebuild program

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SD80MAC rebuild program
Posted by Overmod on Monday, December 04, 2017 6:42 AM

In LocoNotes yesterday (Sean Graham-White, sourced from AltoonaWorks):

NS is about to commence their SD80ACU program which takes SD80MACs and puts them through a program similar to the one that converted SD90MACs to SD70ACUs.
 
- Each unit to be overhauled before the actual rebuild to SD80ACU - Old cab replaced with EMD isolated SD70ACe cab with completely new wiring and electronics
 
- ICE (Integrated Cab Electronics) displays replaced with FIRE (Functional Integrated Railroad Electronics) displays with new EM2000 to replace old EM2000
 
- EPIC air brake replaced with CCB2
 
- Siemens inverters replaced with Mitsubishi inverters
 
- Ultra Cab II installed with Conrail cab signals and LSL (some units already had this changeover)
 
- Rear ditch lights installed and pneumatic bell replaced with electronic bell
 
- Ballasted up to 432,000 lbs 
- 20-710 engine overhauled prior to the rebuilding and upgraded to 5500 hp in the ACU rebuild process
 
- Truck work done as-needed but original Siemens traction motors remain
 
Info from AltoonaWorks

 

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Posted by daveklepper on Sunday, December 10, 2017 1:34 PM

Is any work done on the traction motors?  Other than cleaning and perhaps polishing?

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Posted by zugmann on Sunday, December 10, 2017 3:11 PM

I'm glad they're getting rebuilt.  Also glad I got to run them in their original form (even if they were getting kind of beat). 

Just something about them I like.  Maybe it's the old style EMD widecab with big teardrop windshields?  They were beasts (I never got to run a *true* 6000hp 90mac or AC66whatever).  I have run a 70ACu (rebuilt sd90) on a local already.  Impressive engine - but not quite the same level of a 80mac.  Guess it's just a personal thing.  Something about them.

The opinions expressed here represent my own and not those of my employer or any other railroad, company, or person.

I occasionally post off-topic remarks.  Adults can handle that.

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Posted by Overmod on Sunday, December 10, 2017 8:05 PM

Here's a view you don't often see:

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Posted by Entropy on Monday, December 11, 2017 8:31 PM

daveklepper

Is any work done on the traction motors?  Other than cleaning and perhaps polishing?

 

 

Because they're running locomotives most likely already on a schedule mainteance for the TM combos. Class 1's generally change them out every 3-4 years it looks like for mainline locos, TM's dip, bake, new bearings, new wheel set. That schedule could coincide with the engine work. 

 

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Posted by caldreamer on Monday, December 11, 2017 9:06 PM

Will the extra weight and added horse power increase their tractive effort  (starting and continuous)?

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Posted by oltmannd on Tuesday, December 12, 2017 5:59 AM

caldreamer

Will the extra weight and added horse power increase their tractive effort  (starting and continuous)?

 

The HP won't do anything to raise the starting or continuous TE, but the extra 12,000# will give it a little bump, maybe 4-5,000#.  That'll get one more loaded car up Horseshoe Curve.

 

-Don (Random stuff, mostly about trains - what else? http://blerfblog.blogspot.com/

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Posted by oltmannd on Tuesday, December 12, 2017 6:12 AM

Overmod

In LocoNotes yesterday (Sean Graham-White, sourced from AltoonaWorks):

NS is about to commence their SD80ACU program which takes SD80MACs and puts them through a program similar to the one that converted SD90MACs to SD70ACUs.
 
- Each unit to be overhauled before the actual rebuild to SD80ACU - Old cab replaced with EMD isolated SD70ACe cab with completely new wiring and electronics
 
- ICE (Integrated Cab Electronics) displays replaced with FIRE (Functional Integrated Railroad Electronics) displays with new EM2000 to replace old EM2000
 
- EPIC air brake replaced with CCB2
 
- Siemens inverters replaced with Mitsubishi inverters
 
- Ultra Cab II installed with Conrail cab signals and LSL (some units already had this changeover)
 
- Rear ditch lights installed and pneumatic bell replaced with electronic bell
 
- Ballasted up to 432,000 lbs 
- 20-710 engine overhauled prior to the rebuilding and upgraded to 5500 hp in the ACU rebuild process
 
- Truck work done as-needed but original Siemens traction motors remain
 
Info from AltoonaWorks

 

 

I find it interesting that the rebuild is basically a push.  These locomotives are over 20 years old now and even in their present form, pretty close to state of the art.  

FIRE replaces ICE

CCB2 replaces EPIC 

Mitsubishi inverters replace Siemens

Latest version of Ultracab 

Latest version of isolated cab

The SD80MACs were the most advanced locomotives to hit the road when they were built.  Conrail was a leader in this regard, not just trying things but making them standard on new orders.  First with isolated cab.  First with electronic fuel injection.  First with electronic cab signalling (jointly developed with Harmon Electronics).  First with electronic airbrake.  First with integrated displays. 

The one new thing they have that they weren't built with is PTC/Leader.

-Don (Random stuff, mostly about trains - what else? http://blerfblog.blogspot.com/

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