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Post by flippyff on Dec 18, 2010 20:51:55 GMT
CIS at London Bridge westbound @ 16:49 : 1 Wembley Park 5 mins 2 Wembley Park 10 mins 3 Stanmore 15 Mins <alternating with> Jubilee Line:No service between Finchley Road and Stanmore Train 3 was then changed to Waterloo and all three trains dropped back three minutes. Another message then popped up advising the next Stanmore train was due in 19 mins.    Simon |
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Post by Deleted on Dec 18, 2010 21:55:11 GMT
The snow sort of took the Jubly by surprise I think, I found it funny between Finchley Road and Wembley we were sailing past on A stock whilst the 96's decided to Pack up!
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Post by Deleted on Dec 18, 2010 22:41:02 GMT
The snow sort of took the Jubly by surprise I think, I found it funny between Finchley Road and Wembley we were sailing past on A stock whilst the 96's decided to Pack up! This is the case with the mainline EMU too. The DC motors as fitted to the A60's and MK1 EMU's on mainline are very simple machines and tolerant of supply fluctuations, arcing etc. The AC drive fitted to the new generations of EMU's do not like any interference or harmonics to be a component of the incoming power. So numerous systems have been developed to protect them but they tend to shut everything down at when they detect a problem. The funniest problem was the dropping pantograph episode on the Birmingham cross-city line circa 1994 when the class 323 EMU's encountered ice on the catenary wire and there was some arcing.The on board monitoring system detected this this and lowered the pantograph automatically to protect the train from damage. BR did not know what had occurred so sent another 323 to rescue the unit and that had the same problem - 2 more units were sent and all got stuck at the same point. So in the one hand new EMU's accelerate much faster are smoother than their predecessors but a are somewhat delicate when it comes to bad weather and they cannot easily be coupled to a rescue engine - progress! Xerces Fobe |
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Post by Deleted on Dec 18, 2010 23:43:44 GMT
The UndergrounD has no need to use new high tec computer systems or fancy AC motors!
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Tom
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Post by Tom on Dec 19, 2010 0:15:34 GMT
The UndergrounD has no need to use new high tec computer systems or fancy AC motors! So you'd rather not have any trains in a few years when all the spares for the low-tech computer systems or old motors are used up? |
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Post by Deleted on Dec 19, 2010 12:44:46 GMT
What I meant was that they should still build new trains with the tried, tested. reliable and simple mechansims. No Computer systems should be used
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Post by Deleted on Dec 19, 2010 13:08:26 GMT
What I meant was that they should still build new trains with the tried, tested. reliable and simple mechansims. No Computer systems should be used You won't have any sorts of a capacity increase with DC motors... All the modern systems are more efficient. |
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Post by Tubeboy on Dec 19, 2010 13:48:02 GMT
Points failure at Neasden and various failures, trains, equipment etc. With the delays quickly building up, trains/drivers were in the wrong place. So lots of Westbounds were being short tripped, at one point, every other Westbound train was being turned round at Waterloo.
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Post by Deleted on Dec 19, 2010 16:46:32 GMT
But the modern systems may be more efficient in ideal conditions, but when things go wrong simple stuff wins
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Post by version3point1 on Dec 23, 2010 2:51:18 GMT
It wasn't all the equipment's fault... new DMTs up at the East End have been quite bad at using their crew coverage wisely... thus some of the middle and late turn drivers were going over the 4hrs15/5hrs15 and some trains were leaving Stratford, only to stable at SMD. The exact same problem with coverage happened again on Sunday.
It got progressively worse towards Saturday evening, with no trains in either direction at NGW for 15 minutes, only to have one train (after all that time) get to Canning Town, and then be taken out of service because of 'vomit on the train'. Shortly afterwards, we then lost routes on the departure and arrival roads at SMD. Joy of joys.
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Post by Deleted on Dec 23, 2010 9:57:20 GMT
What I meant was that they should still build new trains with the tried, tested. reliable and simple mechansims. No Computer systems should be used So you would rather have less powerful, less energy efficient trains with relatively poor performance? |
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Chris M
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Post by Chris M on Dec 24, 2010 16:17:01 GMT
What I meant was that they should still build new trains with the tried, tested. reliable and simple mechansims. No Computer systems should be used So you would rather have less powerful, less energy efficient trains with relatively poor performance? ...That have lower capacity (mechanical drive takes more space than electric), have to run further apart (you can't run old trains on new signalling at the same density as you can new trains; you can't run old trains on old signalling at the intensity they used to be able to do without a complete reform of the H&S regulation (including things like Moorgate control), reinstating crossovers, etc,[1] and maybe union agreements too (they'd certainly have their opinions about your changes to H&S if nothing else)) and are less safe in the event of an accident? [1]Which you can't install without massive disruption and cost unless you've already performed this complete restructuring of H&S. Oh and worked out a way to get the cost and availability of appropriately skilled manpower back to how it was back in the "good old days". Of course if everybody took this attitude towards technology, then we'd need to build stables for all the horses  ;D |
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