Re: SBB Cargo Changes

John Beaulieu
 

Re 420/421/430 have been equipped with regenerative braking from
delivery. This is an important difference to BLS Re 425, which are
equipped with dc traction motors versus ac single phase motors on the
SBB locomotives.

So these locomotives have the ability to convert variable frequency AC as generated by the traction motors to 16.7 Hz AC to be fed back into the contact line? Otherwise they would be limited to one speed in regenerative braking as the AC frequency generated by the motors would depend on their rotational speed and the number of poles.

John Beaulieu

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