Re: EE Locos

["Steve Palmano" <steve719@GTE.net>]

Aus loco discussion mailing list

Many thanks for this information.

I suspect that the 9 notch controllers of the X and Y classes are rare.  But
there are quite a few gaps in my knowledge in respect of EE loco control
systems, so who knows, there might be others.

More information begets more questions, thus re the Tasrail ZP and ZR locos,
were these reconfigured with EM governors to have 8 discrete engine speeds,
as with GM/GE/Alco practice, or did they revert to the previous EE scheme of
3 (or 4) engine speeds coupled with control of main generator excitation to
obtain the 8 control steps?

Cheers,

Steve Palmano

----- Original Message -----
From: Mike Dix <mdix@mrt.tas.gov.au>
To: 'Aus loco discussion mailing list' <Ausloco@listbot.com>
Sent: December 14, 1999 06:13 PM
Subject: RE: EE Locos


> Aus loco discussion mailing list
>
> The following is some relavent info from Andrew Dix about the TGR X and Y
> locos
>
> X and Y were EM controlled, but with 9 notches which seems to be uncommon.
> Among other things, the tram style controllers controlled engine speed by
> way of
> solenoid valves on the engine governors.  Hence Xs and Ys only had three
> working
> speeds on their engines.  If you wanted to play with engine speeds up or
> down
> from these three you have to manipulate the hand throttle that is on the
> side of
> the engine governors.
>
> The top plates of the controllers they obtained for the Ys were numbered
up
> to
> notch 12, but in reality they only had 9 notches.  Wonder if the
controllers
> were second hand or just modified to suit the TGR?
>
> By way of extra info, the two Tasrail ZR/ZP class EE locos are now being
> used in multi-unit with the EMD locos. This has only been possible because
> of rewiring to the 74 volt system and replacing the infinitely variable EE
> contollers with notched controllers. There was initially a problem of
> compatibility between the three and four pipe system but the two locos
have
> now been modified to three pipe. Combinations so far noted have been
> ZR-DQ-ZP, ZR-QR-ZP and DQ-QR-ZP. They will use the EEs as lead locos in
> preference to the EMD because of their better cab environment.
>
> Michael Dix
>
>
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