Re: [NSW] Strange rails at Hurstville

[alberta@zip.com.au (Albert Alcoceba)]

On Sat, 24 Jun 2000 16:32:45 +1000, Graham Fry <fryg@sydpcug.org.au>
wrote:

>I am not sure whether this explanation now applies. In the past when the
>city underground was built the additional rails were placed in position
>between the running tracks and electrically bonded to them. Their
>purpose was to reduce the electrical resistance for the return current
>from the train back to the supply substation.

But I believe the trains also had carbon brushes to make contact with
the extra rails to facilitate this earth return.  This is not the case
now.

Albert Alcoceba
  <><
alberta@zip.com.au
http://homepages.tig.com.au/~alberta