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Re: 42220

AFAIK all 81s and all NRs.
Probably all Gs, BLs and 82s too.
Possibly more (stuff for Westrail?).

81s had troubles in the long tunnel on the Ulan line, as the system relied
on a reading of true speed from looking at the ballast: no light, and no
ballast.

-- 
Regards
Roderick Smith
Rail News Victoria Editor

Ronald BESDANSKY <ronbest@bigpond.com> wrote in article 
> Was this the only loco to be fitted with the microprocessor control
system
> which achieved greater tractive effort by allowing the wheels to slip
> slightly when accelerating? Or is it commonplace nowadays?
> What effect does it have on rail wear?
> (I remember being surprised when I heard that the co-efficient of
friction
> is greatest just AFTER the wheels begin to slip, rather than immediately
> BEFORE, which is what we were taught in physics at Uni.)