I have in my archives a Commonwealth Railways WTT from the mid-60s -
maybe even as early as '63. As far I can recall the various time and
load tables in that document refer to GM 4-motor and GM 6-motor
classes, and sometimes GM1 and GM12 classes. There is certainly no
reference to "F" or "S" ("Four" or "Six" I would warrant).
That being said, the 1996 book "Locomotives and Railcars of the
Commonwealth Railways" says on p56:
'The GM12s were also often referred to in official circles as the "S"
type, whereas the GM1s were known as the "F" class'
Certainly I have never heard these locos referred to as anything other
than GM1/GM12 or 4-motor/6-motor, and this particular sentence does
not have any official reference attached to it, but I guess it is
possible.
Cheers...JD
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John Dennis jdennis@acslink.net.au
Melbourne denjo02@cai.com
Australia http://www.acslink.net.au/~jdennis
Dutton Bay Tramway pages updated 14 June