On Jan 19, 12:39 pm, "David Biddulph" groups [at] biddulph.org.uk
wrote:

Velocity is the first derivative, and acceleration is the second derivative.
What are you regarding as the third derivative

Which - as was posted above - is ''jerk'' which does exactly what it
says on the label.

I had noticved this on the Vic. too.

Agreed the Central does seem to have got that bit right ... although
the whole was a long time coming.

Had I not taken the job I have now I *would*have been on the Victoria
line resignalling project and no doubt might have been able to offer
some insight into comments in this thread. But I'm not, so I can't.

That job was with Metronet so I dodged than one ... phewww ... )



--
Nick