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On 07/12/2013 19:25, d wrote:
On Sat, 07 Dec 2013 18:57:47 +0000 Graeme Wall wrote: On 07/12/2013 17:07, d wrote: On Sat, 07 Dec 2013 12:20:30 +0000 Graeme Wall wrote: On 07/12/2013 11:26, d wrote: AFAIK its done by a timetable system - not by simply picking up a train id at the trackside and setting the route accordingly. Back in the 1960s the Northern Line was using automatic route setting equipment. Used a giant pianola type roll with punched holes. Thats nice. And that is the same as picking up the id from a train on the track, how exactly? The way I see it if the giant piano wants to send train A to Barnet and train B to edgware but the trains arrive in the order B - A , then its screwed. That's why you work to a timetable. Face - palm. We're going in circles here. Never mind. You wanted to know why they worked to a timetable. -- Graeme Wall This account not read, substitute trains for rail. Railway Miscellany at http://www.greywall.demon.co.uk/rail |
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