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Post by br7mt on Sept 27, 2011 21:15:39 GMT
Version 7 is now being rolled out, which enhances acceleration rate when the train is lightly laden. Per train, per car or per VOBC? Per train. Regards, Dan |
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Post by Deleted on Sept 28, 2011 12:09:09 GMT
Why enhance acceleration when lightly laden? Surely it should be the other way round - to compensate for the extra weight? In any case, surely if the train is running to time, the enhanced performance will not be used - judging by comments earlier in this thread. From my experienxce, the acceleration rate seems to vary greatly depending on the time of day etc. I guess line voltage plays a part. Probably a Sunday morning service will be far quicker due to more volts being available.
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Post by jardine01 on Sept 28, 2011 14:39:26 GMT
It is quite rare to see a empty Jubilee line train. The only place i can think of is the Stanmore end of the line which is quite quiet. Is the verison 7 performance upgrade just an off peak extra power thing or has the major performance upgrade already taken place on these trains? The 2009 and the 1992 stock give a consistent High performance all the time the 1996's vary greatly. However TBTC/ATO is not very aggressive like the sister Central and Victoria lines. I know that the reason why is because their ATO systems are fixed block and the Jubilee is fixed block. But why cant TBTC just give the same performance day in day out? Surely when 33 trains per hour comes next year things will speed up a bit? Even with the new timetable trains are very leisurely stopping at some stations.
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Post by Deleted on Sept 28, 2011 22:25:22 GMT
Surely when 33 trains per hour comes next year things will speed up a bit? In that case, maybe we should wait until the promised 33 trains per hour arrives next year instead of worrying ourselves to death about it now. In 2012, if they manage 33 trains per hour they'll have done what they said they'd do and end of story, regardless of whether you or me think they're faster or slower. If they don't, well I'm sure they'll be called to account on here! In the meantime, it's just speculation.  |
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Post by Deleted on Sept 29, 2011 2:37:59 GMT
Surely when 33 trains per hour comes next year things will speed up a bit? Experience of travelling on metro lines running more than 30tph has found that "things" tend to slow down, as trains regularly catch up with the preceding trains around stations. |
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Post by chrisvandenkieboom on Sept 29, 2011 14:43:25 GMT
For that, there has to be a system that tells the driver or T/O everything about the train in front of them... or is that part of TBTC?
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Post by jardine01 on Sept 29, 2011 14:52:37 GMT
No, on the TOD it displays target speed and current speed and The distance to the the next station.
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Post by br7mt on Sept 29, 2011 18:41:21 GMT
You might want to check that - I think the distance count down is to the limit of your movement authority.
The reason for making it faster when lightly laden is simple (and as I posted previously): to get trains back to the central core quicker. You will not see the full benefits of this until the next major timetable upgrade, which I understand is now scheduled for Spring 2012.
Regards,
Dan
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Post by jardine01 on Sept 29, 2011 20:26:50 GMT
But with 33 trains per hour won't things get slower? As trains will be catching up with each other unless it is timetabled so they don't.
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Post by Deleted on Sept 29, 2011 21:24:02 GMT
But with 33 trains per hour won't things get slower? As trains will be catching up with each other unless it is timetabled so they don't. Will they be able to transport more passengers per hour at 33tph? |
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Post by Deleted on Oct 2, 2011 19:33:49 GMT
Well things are running faster now with an increase from 24 max to 27 tph, so the new system certainly has spare capacity. Where has the figure of 33 tph come from? I thought it was only going up to a max of 30 tph. There are not physically enough spare trains in the JL fleet to go up to 33 tph surely?
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Post by jardine01 on Oct 3, 2011 17:10:19 GMT
I think there is 63 trains on the line. But they cant surely be out at once like what if some trains are defective and cant be used that is going to affect trains per hour. is 27 trains per hour one every 2-3 minutes? Also is 27 trains per hour just a peak thing or does it cover off peak?
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Post by tecchy on Oct 3, 2011 17:52:27 GMT
The performance upgrade will mean they can cram more people in on more trains at the peak - but not necessarily faster. In the off peak they will be able to increase people's journey times.
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Post by br7mt on Oct 3, 2011 18:25:05 GMT
The requirement of both new timetables (the current one and the one due next Spring) is 57 trains plus two spares from a fleet of 63.
Pre-TBTC and until the latest timetable was implemented it was 51 trains plus two spares.
I think the widely talked about 33tph is through the central core, which is Waterloo to Canary Wharf.
Regards,
Dan
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Post by Deleted on Oct 3, 2011 21:21:44 GMT
The requirement of both new timetables (the current one and the one due next Spring) is 57 trains plus two spares from a fleet of 63. Pre-TBTC and until the latest timetable was implemented it was 51 trains plus two spares. I think the widely talked about 33tph is through the central core, which is Waterloo to Canary Wharf. Regards, Dan Next timetable (WTT12) starts from March 25th 2012 with a peak frequency of 29/30tph. 33tph is technically possible but not with the number of trains available for service. |
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Post by jardine01 on Oct 5, 2011 6:19:48 GMT
With the Current timetable are things genrally much quicker than the old timetable or is it about the same?
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Post by Deleted on Oct 5, 2011 11:28:53 GMT
I can't say I have noticed a huige difference, maybe a few faster times on some station to station sections. However, still variations of very fast running, then slower running due to - either catching up train ahead - or being on time. Unlike the Central, the Jubbly trains dont tend to run flat out all the time.
Running into Stratford still subject to slower running and frequent signal stops awaiting a clear platform.
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Post by Deleted on Oct 5, 2011 11:31:00 GMT
is 27 trains per hour one every 2-3 minutes? Also is 27 trains per hour just a peak thing or does it cover off peak? It's simple maths. 60mins/27tph = every 2.22 mins (on average) Or if you need to know the seconds. 60mins x 60secs = 3600 secs per hour 3600/27tph = every 133.3secs which is every 2mins 13 secs (and 300ms). |
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Post by t697 on Oct 5, 2011 18:28:09 GMT
From travelling on the JL in the peaks recently it seems the T/Ops have been briefed to use the PA as a 'hustler' to improve service performance; Something along the lines of "This train is departing now, stand clear", then closing the doors straight away. Certainly seems effective in reducing dwell times. I've not found it objectionable as long as there really is another train just 2 mins or so behind.
More silly was an off peak journey from Westminster to Neasden. 11 stops and on 9 of them I was 'thanked for travelling on the Jubilee line' and reminded 'to keep my PERSONAL belongings with me at all times'. I was wondering whether these ones had been added to the auto messages rather than driver triggered, until there were a couple of stops without. I always thought those two messages were particularly useless.
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