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Post by DrOne on Jun 11, 2009 9:19:39 GMT
Thanks Nick. Very informative  |
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Deleted
Deleted Member
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Post by Deleted on Jun 11, 2009 10:45:46 GMT
Whilst on the subject of signalling bottlenecks - Finchley Rd to West Hampstead NB seems to also be a bottleneck. The starter at Finchley Rd tends to take on average 2mins5secs to clear. Add 25secs for operating margin, and you have a a 2min30sec headway = 24tph.
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mrfs42
71E25683904T 172E6538094T
Big Hair Day
Posts: 5,922
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Post by mrfs42 on Jun 11, 2009 10:57:03 GMT
Is it perhaps the proximity of SOU to WAT stations means always a low average speed - there is not much can be done about that. In that case, (purely from a bit of idle thought), did you notice anything exceptional going East over the same section with TH6 - A166 - (back of) TP2? Same distance, just climbing.... Perhaps the limiter is that the limit of A161's control would be the blockjoint beyond TH8, therefore including any stationary trains or departing trains from Waterloo. Whilst on the subject of signalling bottlenecks - Finchley Rd to West Hampstead NB seems to also be a bottleneck. The starter at Finchley Rd tends to take on average 2mins5secs to clear. Add 25secs for operating margin, and you have a a 2min30sec headway = 24tph. Is that not a product of a similar reason to above - the limit of control for JD29 includes the platform at West Hampstead i.e JD29 to JD25/24? Just a random guess..... |
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Post by d7666 on Jun 13, 2009 14:49:06 GMT
I can't say I ever noticed EB issue.
I suppose in hindsight if I had been interested enough I could have extracted the system logs for the area into excel and come up with some proof.
SOU -> WAT seemed to be the controlling throttle when all running well.
I agree FIR -> WHD is also short and also throttles but as far as I can recall only when things were out of course.
That suggests the impact SOU/WAT > FIR/WHD.
But I'll repeat I'm neither a signaller nor a conventional signals engineer, so these comments can be read as those of an interested layman, and treated accordingly.
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Nick
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