C44ACi's and software updates

 
  BDA Chief Commissioner

Location: Sydney
I never got around to asking when this was done and how /where the testing took place . I understand that the performance improvement got them closer to what the EDI's can do and got Rail Corps nod to pull similar sorts of loads .

Anyone know the details ?

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  X_Class Junior Train Controller

Location: Hunter Valley
I don't know the details, however there has been some "fine tuning" of the traction management software on the 92s by GE I'm lead to believe.

In my opinion they perfom well. The last few times I've had triple 92s is with a 91 long coalie for 10,920t  and they went better than any other engine combo up Nundah & Minimbah bank. They settled in at about 19/20 all the way. Triple 90s usually do about 16-18.

The only complaint I have is that they sand too much when its not needed. In low notches at speed they just start sanding for no reason even if youre only apllying about 60 or 70KN in dyno or power. The 90s rarey sand even when pulling 1200amps!
  UserTMP Station Master

The bulk of the software changes were made by GE from Data recorded on the 92 class on Cowan bank and in revenue service. There was also some data collected from 6002's first run to Adelaide. It had quite a lot of sensors placed on the bogies for dynamic performance recording.

The 6000 class are also performing above their weight in the Hunter, though they have an issue where the sand box air supply hoses are too easily clogged, which hampers performance dramatically. The 92 class won't have that issue with the different sand arrangement.
  BDA Chief Commissioner

Location: Sydney
Its interesting that the 92s are starting to do it better than the heavier Super Series 90s . How do the two compare when doing hill starts with big loads ?
  X_Class Junior Train Controller

Location: Hunter Valley
Its interesting that the 92s are starting to do it better than the heavier Super Series 90s . How do the two compare when doing hill starts with big loads ?
"BDA"


The 90s do lift a load on a grade from a standing start a lot smoother and seemingly easier. The 92s are far more dramatic! They need help to do it smoothly - a bit of independent usually helps, but once under way there are fine. Its the (sometimes violent) ramping up & down of tractive effort thats the issue.
  M636C Minister for Railways

How do the loads hauled by the 92s and the TTs compare?

Do the TTs share the tractive effort "on and off" effect of the 92s?
The TTs have the same ground radar for wheelslip control as the 90 class and this might give an advantage in tractive effort control...

And do the "heavy and "light" TTs haul different loads? I've seen them running in mixed groups together...

M636C
  Alco251_244 Chief Commissioner

Location: Somewhere
SCT's have the ground radar speed so I would say the TT's do too. I have had a pair of SCT's in the wet where the radar speed said 0km/h and the speedo said 0.9km/h. Needless to say if it wasn't for the dry track in the Yantaringa tunnel we probably would have stalled.
  X_Class Junior Train Controller

Location: Hunter Valley
How do the loads hauled by the 92s and the TTs compare?

Do the TTs share the tractive effort "on and off" effect of the 92s?
The TTs have the same ground radar for wheelslip control as the 90 class and this might give an advantage in tractive effort control...

And do the "heavy and "light" TTs haul different loads? I've seen them running in mixed groups together...

M636C
"M636C"


Yes, the TTs share the same issue of surging, but they go about it in a different way. They too can get "violent" if not managed correctly.

Through nothing other than just trying out different things, I've come to the conclusion that the best way to lift a load with TTs is to select a notch more than needed and leave about 200kpa in the independent. This creates a constant force for them to work against which in turn makes them build up tractive effort and keep it there - resulting in a cleaner/smoother launch. That is what I did last night on a standing start at the top of Minimbah bank with triple TTs and 88 loaded.

The only thing to keep in mind when doing the above is if you have B trucks on. If you are trying to lift it when all or most of the train is on a ruling grade, you'd be testing the limits of the drawgear even without 8 wagons digging in with thier brakes on. But then again its probably better then the surging that would otherwise take place.

And no, all variants of the TTs haul the same as far as I know.
  BDA Chief Commissioner

Location: Sydney
So does this mean the Edi's and 92s are rated for the same loads ?

One further , are the ACs (all) being used over the Liverpool Ranges and what differences have they made .

Cheers .
  X_Class Junior Train Controller

Location: Hunter Valley
So does this mean the Edi's and 92s are rated for the same loads ?

One further , are the ACs (all) being used over the Liverpool Ranges and what differences have they made .

Cheers .
"BDA"


Yes they are rated the same as far as Im aware.

Only the TTs and WHs are being used up there. Im not aware of the 92s running up there at this stage. One thing I was made aware of last week is that rail creep is becoming an issue on the sydney side of ardglen due to the extremely strong dyno. Some drivers have been using full dyno, which at around 40-50 is at its strongest is that is suspected of causing the rail creep.

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