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why are the new Victoria and trains so slow?
wrote in message
... On Mon, 08 Aug 2011 04:53:12 -0500 wrote: It rather depends how you count the introduction of regenerative braking, surely? I was assuming without. The effectiveness of regenerative braking varies anyway , plus I don't understand how it can work well on the tube with all the seperate sections of traction supply the lines have. Surely it will only work if theres another train fairly close by? Not necessarily. I understand one of the prerequisites for the introduction of regenerative braking on the Central Line was a requirement to replace older motors in escalators at stations. They share their supply with the traction and needed to be able to handle the greater variations in supply voltage. -- DAS |
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why are the new Victoria and trains so slow?
On Mon, 8 Aug 2011 23:21:06 +0100
"D A Stocks" wrote: Not necessarily. I understand one of the prerequisites for the introduction of regenerative braking on the Central Line was a requirement to replace older motors in escalators at stations. They share their supply with the traction and needed to be able to handle the greater variations in supply voltage. Does that mean the escalators speed up slightly when a train brakes into a station? Seems a good idea - get the passengers from the last train out of the station quicker! B2003 |
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why are the new Victoria and trains so slow?
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why are the new Victoria and trains so slow?
On Tue, 9 Aug 2011 13:47:22 +0100
Roland Perry wrote: In message , at 09:54:29 on Tue, 9 Aug 2011, d remarked: I understand one of the prerequisites for the introduction of regenerative braking on the Central Line was a requirement to replace older motors in escalators at stations. They share their supply with the traction and needed to be able to handle the greater variations in supply voltage. Does that mean the escalators speed up slightly when a train brakes into a station? Seems a good idea - get the passengers from the last train out of the station quicker! Hopefully they stay the same speed, but don't draw as much "external" power for a few seconds. Ah pity. I had images of a couple of particularly full trains pulling into a station at the same time and people being flung off the top of the escalator over the ticket barriers B2003 |
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why are the new Victoria and trains so slow?
In article , d ()
wrote: On Tue, 9 Aug 2011 13:47:22 +0100 Roland Perry wrote: In message , at 09:54:29 on Tue, 9 Aug 2011, d remarked: I understand one of the prerequisites for the introduction of regenerative braking on the Central Line was a requirement to replace older motors in escalators at stations. They share their supply with the traction and needed to be able to handle the greater variations in supply voltage. Does that mean the escalators speed up slightly when a train brakes into a station? Seems a good idea - get the passengers from the last train out of the station quicker! Hopefully they stay the same speed, but don't draw as much "external" power for a few seconds. Ah pity. I had images of a couple of particularly full trains pulling into a station at the same time and people being flung off the top of the escalator over the ticket barriers Did anyone else here ever stand on the platform at Essex Road in Northern City Line days? The platform lights were fed from the traction supply so dimmed sharply when a train started away. Of course the platform was empty at that point as the passengers had all got on the departing train but we were changing directions there on the Underground trip in 1970. -- Colin Rosenstiel |
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why are the new Victoria and trains so slow?
In message , at 23:21:06 on Mon, 8 Aug
2011, D A Stocks remarked: I understand one of the prerequisites for the introduction of regenerative braking on the Central Line was a requirement to replace older motors in escalators at stations. They share their supply with the traction and needed to be able to handle the greater variations in supply voltage. That's quite interesting. I've been at a couple of National Rail stations (one SWT, one FCC) where the power had failed to the station itself, but remained in place for the trains. Neither had escalators. -- Roland Perry |
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why are the new Victoria and trains so slow?
On Tue, 9 Aug 2011 13:46:11 +0100, Roland Perry
wrote: That's quite interesting. I've been at a couple of National Rail stations (one SWT, one FCC) where the power had failed to the station itself, but remained in place for the trains. Neither had escalators. Unlike NR, LUL once had dedicated generating capacity, so it kind-of makes sense. Neil -- Neil Williams, Milton Keynes, UK |
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why are the new Victoria and trains so slow?
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