NT Class again

["Timothy Parsons" <tnp4306@hotmail.com>]

Aus loco discussion mailing list

Hello again to Ausloco'ers from the other side of the world.

I was following with interest the thread on this list back around Christmas 
regarding the CR/AN NSU/NT/NJ loco's.  I think it was Steve Palmano who was 
trying to get to the bottom of the control systems on NSU's and NT's.

After some long overdue tidying up at home (including unpacking some boxes 
that had not been unpacked since I came over here from Australia several 
years ago!), I came across a copy of the "Control Apparatus and Electrical 
Machines" Maintenance Manual for the NT class (Book No. 1050/1 jointly 
published by Sulzer, Tulloch and AEI).  Steve I think was suggesting that 
the NT's had a continuously variable EP throttle based on the Sulzer/BRCW 
design and asked for confirmation if this was so.

The Maintenance Manual in fact confirms that this was not quite the case.  
To quote from the manual:

"Engine Control - 18 power notches controlled, the lower 5 by fixed steps of 
exciter battery field adjustment and the remainder by variation of air 
pressure to the diesel engine governor."

The manual also contains a lot of detailed cutaway diagrams showing the 
notch number indicator plate and the cam operated master controller contacts 
etc.  The maintenance procedures also state that the spring in the master 
controller handle should be set so as to return the handle "smartly" from 
notch 18 to notch 17 and keep it there.  Would this indicate that you would 
not normally run the loco in notch 18?

I cannot answer the question about MU capability with NJ's, but the manual 
confirms that NT's were able to run with up to 3 units (of either NT or NSU 
class) in multiple, but that when running in multiple with NSU's, the NSU's 
lubricating oil priming procedure would require special attention (no 
details given).  The manual also states that the auxiliaries on the NT's 
indeed operated at 110 volts as Steve suggested.

I hope this is of some help in answering some of the outstanding points on 
this old thread!

By the way, many years ago, I was told (tongue in cheek), that the class 
designations should really stand for the following:

NSU = Non Serviceable Unit
NT = Not Trafficable
NJ = Not Junk

I'll let others decide on their appropriateness...

All the best,

Tim (in England and starved of Alco's) Parsons
tnp4306@hotmail.com
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