Re: Super Series 42220

[mauried@commslab.gov.au (Maurie Daly)]

In article <7ib2j8$8jq$1@lios.apana.org.au> craigd@lios.apana.org.au (C. Dewick) writes:
>From: craigd@lios.apana.org.au (C. Dewick)
>Subject: Re: Super Series 42220
>Date: 24 May 1999 18:28:24 +1000

>In <keithm.34.3748FEEC@commslab.gov.au> keithm@commslab.gov.au (Keith Malcolm) writes:

>>From what i've heard if the super series works or not is purely acedemic, as 
>>the super series dosen't work if the loco is in multiple with a non SS loco. 
>>The only time 42220 works at any where near where SS would be an advantage it 
>>has been in multiple with 422s 48s or 80s.

>AFIAK, the adhesion control works all the time in 81's and 42220, but when
>coupled with other units the effect is nullified because the other units
>don't have the same control system. I don't think there's any special wire
>in the 27-pin jumpers which is used as a "yes I have adhesion control
>fitted" signal, but I could be wrong here.


Its not so much that the wheel creep is nullified when used with a non SS loco.
The problem is that the non SS loco can go into uncontrolled wheel slip whilst 
the SS loco isnt slipping, and if the SS loco is the one being driven , the 
driver wont know whats happening with the other unit .
ie the MU cable doesnt feed back wheel slip indication.
All the later EMD locos , ANs.Qs,81s/Gs/BLs,82s,90s etc have wheel creep.
Dont know about the rebuilt MK locos.
A more interesting question is can the EMD system co-exist with the GE micro 
sentry,ie is the load of an NR + 81 the combined loads of the locos when used 
singly?


MD