wrote in message
...
On Mon, 08 Aug 2011 04:53:12 -0500
wrote:
It rather depends how you count the introduction of regenerative braking,
surely?
I was assuming without. The effectiveness of regenerative braking varies
anyway , plus I don't understand how it can work well on the tube with all
the
seperate sections of traction supply the lines have. Surely it will only
work if theres another train fairly close by?
Not necessarily. I understand one of the prerequisites for the introduction
of regenerative braking on the Central Line was a requirement to replace
older motors in escalators at stations. They share their supply with the
traction and needed to be able to handle the greater variations in supply
voltage.
--
DAS