"Clive Coleman." wrote in message
...
In message . com, Paul
Weaver writes
On Monday morning, an entertaining driver on the central line informed
us that this was "the 09:18 from Woodford, calling all stations to
West Ruislip, due to Stratford at 09:xx, Liverpool street at 09:yy,
and Holborn at 09:zz"

While this is guessable (Epping to White City takes bang on an hour on
most trips), I am dimly ware that there are working timetables for
tube lines. How often to trains run to these times, and is it possible
to get a copy of these? With a 10-15 minute wait at the extremeties,
even at 9AM, it would be nice to see when trains are due. Some lines
have a live ETA, but the central line doesn't. The WAP service at
http://wap.tfl.gov.uk/tfldepboard/ tends to break down whenever I try
and use it in anger

When I worked down there, both Central and Northern were timetabled to the
half minute and on the Northern if you were more than seven minutes late
you were turned early to keep in sequence for the programme machine on
Kennington platform.
--
Clive.
Clive

The half minute timing accuracy was down to the programme (sequence)
machines stepping every half minute. The timetables on the machines ran in
half-minute time (from 0300 to 0300 the next day) with 0 at midday - half
minute time was the most you could do within the limits of a computer
integer (8 bit - +/-32767 IIRC).

The Central Line computer control ran internally to quarter minute timings,
but the Timetable software used in developing and printing of the published
timetables (and also the computer control timetables) could only cope with
half minute resolution.

Peter
--
Peter & Elizabeth Corser
Leighton Buzzard, UK



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