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Post by tubeprune on Jan 15, 2011 7:31:48 GMT
I was wondering what the differences are between the two systems in terms of train performance. My understanding is that the Central uses a brake rate of 1.15m/s2 in tunnels and 0.75m/s2 in the open and that this is reduced to 0.65m/s2 in bad weather. Can anyone confirm if this is still correct and does anyone know the equivalent rates for the Jubilee?
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Post by d7666 on Jan 15, 2011 14:39:32 GMT
Thats a very good question.
Without knowing the values, I'd suggest the brake rates would be the same - since the limiting factor is not dynamic or friction braking capacity but wheel rail adhesion and the laws of physics don't change between lines.
I will see what I can dig up, unless anyone posts the answers first of course.
--
Nick
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Post by tubeprune on Jan 16, 2011 17:54:43 GMT
Thanks, Nick.
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Post by Deleted on Jan 26, 2011 21:57:01 GMT
Jubilee current brake rates are normally 1.0 m/s/s below ground and 0.8 m/s/s above ground, unless reduced for adhesion reasons to 0.7 or 0.5 m/s/s (can go to 0.4 m/s/s)
Bearing in mind ATO only just introduced, I suspect this will be improved - 1.2 m/s/s I believe is the harshest rate that can technically be selected
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Ben
fotopic... whats that?
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Post by Ben on Jan 31, 2011 22:31:15 GMT
Is there the ability then to go up in increments of 0.1ms^-2, or is that more a coincidence?
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Post by Deleted on Feb 27, 2011 11:35:52 GMT
I thought the Central in the open always brakes the same whatever the weather?
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Post by auxsetreq on Feb 27, 2011 20:04:35 GMT
I was wondering what the differences are between the two systems in terms of train performance. My understanding is that the Central uses a brake rate of 1.15m/s 2 in tunnels and 0.75m/s 2 in the open and that this is reduced to 0.65m/s 2 in bad weather. Can anyone confirm if this is still correct and does anyone know the equivalent rates for the Jubilee? Can anyone confirm what this actually means in bog standard English? I must admit to wanting to dig up Doris Stokes to get in contact with Albert Einstein to actually find out what this means, but as it's been raining I don't want to get muddy and I have a phobia about worms and coffin lids............. Debden EB, the braking profile for some reason is set to *gentle* - I reckon it's the trees and their ATO killer sap. It's quite slippery there. 'part from that I don't see any difference anywhere, upstairs or down, though upstairs in the light rain like today the ATO has been, well, rubbish..........But, don't worry. Boris'll have his super reliable driverless trains for the Olympix this time next year. It's all a *piece of cake*............ |
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Post by Deleted on Feb 27, 2011 20:35:13 GMT
Hainult depots the test track?
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Post by Deleted on Feb 27, 2011 22:55:59 GMT
I thought the Central in the open always brakes the same whatever the weather? The control room can adjust the braking rates on the Central, and they can also on the Jubilee at any time. In reality, not sure how many adjustments are typically made - I suspect not many! |
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Post by Deleted on Feb 28, 2011 20:12:52 GMT
Yeh, I thought the general idea was just to drive in CM when the weather is bad.
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