Re: ----The s-p-e-e-d of a train-----[ NSW]

[" Ian" <iansmith@optusnet.com.au>]

Many thanks to you all for the very informative
replies.................................
Rgds Ian
<signal_spotter@my-deja.com> wrote in message
8geuh4$47c$1@nnrp1.deja.com">news:8geuh4$47c$1@nnrp1.deja.com...
> In article <392a1b53$0$2641@news01.syd.optusnet.com.au>,
>   " Ian" <iansmith@optusnet.com.au> wrote:
> > I wonder if some of the group can help me?
> > How is the speed of a train  determined ? I presume that the driver
> has some
> > instructions -signage etc.
> > I ask this question because , on a train from Seven Hills to
> Westmead, some
> > days ago,the speed seemed excessive, to the point it concerned quite
> a few
> > passengers. The whole set was bouncing around a fair bit and it was
> very
> > hard to stand.
> > A few comments to the guard at Westmead by some travelers,were just
> laughed
> > off.
> > Rgds...............................
> >
> >
> The speed of a train is determined by speedboards. In NSW they are
> yellow with a black number on them eg 80 which means 80 kmh. At
> turnouts there is an advisory speedboard with 25 on it which tells the
> driver to limit his speed to 25 kph through the points. If the XPT uses
> the same line then it has it's own speedboard mounted on top of the
> normal one. At Glenfield there are 3 speedboards on top of each other
> for XPT, Tilt Train and normal. That was when they had the prototype
> Tilt train buzzing around. Anyway the line speed is determined by
> factors such as curvature of the rail, track condition etc. The
> signalling is worked out based on the line speed (not the other way
> round) so if the speed is 100 kph then we'll work out the service
> braking, trip braking, route locking timers etc based on that figure.
> So 100 kph equates to 27.7 m/s. Anyway hope this helps.
>
> regards
>
> Ian Hayes
> Signal Design Engineer
>
>
> Sent via Deja.com http://www.deja.com/
> Before you buy.