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Post by brigham on Oct 14, 2020 13:31:46 GMT
This is indeed the case; in fact one of the Quayside branch shunters still exists.
The trouble only became apparent when the pressure rose to 1500 volts, rather than the 600v of the Tyneside system.
I imagine that the express speeds played a part, too.
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vincenture
Quiz tryhard, and an advocate for simpler, less complicated rail routes
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Post by vincenture on Oct 16, 2020 7:22:05 GMT
I thought we're talking about the Battersea extension hmmm lol
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Post by brigham on Oct 16, 2020 7:27:25 GMT
We were. We were talking about 22kV third rail operation on the Battersea Extension. Back on topic: Does anyone think it's feasible?
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class411
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Post by class411 on Oct 16, 2020 8:10:42 GMT
We were. We were talking about 22kV third rail operation on the Battersea Extension. Back on topic: Does anyone think it's feasible? That depends what you mean by 22kv third rail. If you mean that literally, then, no, it's absolutely not, for any number of reasons. If you mean 22kv to substation, then, yes, it is.
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Post by quex on Oct 16, 2020 9:43:21 GMT
The highest voltage I can think of that's been used for a third rail system is 1500v DC, which has been used on a number of systems in China. These all have underside-contact third rail, however.
The problem with low voltage DC transmission is that, as the voltage is lower, the current must be higher to deliver a certain power. Higher currents lead to greater power losses (e.g. from conductor rail heating) which means the voltage drops the further from the substation you go. This is why low voltage DC systems have substations at such regular intervals.
The Chinese engineers were increasing the voltage to lessen the effect of this, but obviously there's a limit to how high the voltage of a ground-level conductor can be. This safety limit may or may not be more flexible in China - apparently in one case 1500v DC was chosen on the whim of a politician.
22kV is a typical subtransmission voltage at the level that would be supplied to DC railway substations before it's steped down to traction voltage, and is almost certainly what the original comment was on about with regards to the Battersea power supply.
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class411
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Post by class411 on Oct 16, 2020 10:34:21 GMT
I wonder if, had we not already built third rail systems, the powers that be would allow such a thing to be built today.
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Post by t697 on Oct 16, 2020 17:21:45 GMT
I wonder if, had we not already built third rail systems, the powers that be would allow such a thing to be built today. Probably not. The authorities are against extensions of ground level electrification in open section railways.
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Post by croxleyn on Oct 17, 2020 8:09:02 GMT
I wonder if, had we not already built third rail systems, the powers that be would allow such a thing to be built today. Probably not. The authorities are against extensions of ground level electrification in open section railways. But just imagine what a cat's cradle would be needed for overhead wiring... At every rail switch, a tensioner is needed for the new-starting catenary, so for the likes of Waterloo, and especially Victoria, with the throats being full of track and points anyway, where would all the masts be fitted in?
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rincew1nd
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Post by rincew1nd on Oct 17, 2020 9:28:09 GMT
Probably not. The authorities are against extensions of ground level electrification in open section railways. But just imagine what a cat's cradle would be needed for overhead wiring... At every rail switch, a tensioner is needed for the new-starting catenary, so for the likes of Waterloo, and especially Victoria, with the throats being full of track and points anyway, where would all the masts be fitted in? They seem to cope at Euston, King's Cross etc. Manchester Piccadilly even coped with two different OLÉ voltages when the Woodhead Pass route was open!
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Post by superteacher on Oct 17, 2020 11:08:39 GMT
A fascinating general chat about power supplies, but can we limit ourselves to the Battersea extension, thanks.
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Post by grumpycat on Oct 23, 2020 1:10:50 GMT
Have the announcements been recorded for the extension yet?
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Post by grumpycat on Oct 23, 2020 1:11:23 GMT
Apologies for doing a 2nd reply has a 95 stock gone down to battersea yet?
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Post by Dstock7080 on Oct 23, 2020 9:51:14 GMT
Apologies for doing a 2nd reply has a 95 stock gone down to battersea yet? Not yet, engineering trains only - and the lesser spotted Michael Portillo filming there again this week.
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Post by Dstock7080 on Dec 28, 2020 8:48:17 GMT
The first test runs to visit Nine Elms and Battersea Power Station using ‘95 Stock were undertaken on 19 December, using 51597, these have continued over recent days.
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Post by sawb on Dec 28, 2020 12:05:54 GMT
How and when are the tests being run? Is it a case of terminating specific trains from the Charing Cross branch at Kennington and using them, or does that mean the driver can't take a break whilst sitting in the loop?
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Post by Dstock7080 on Dec 28, 2020 12:09:31 GMT
How and when are the tests being run? Is it a case of terminating specific trains from the Charing Cross branch at Kennington and using them, or does that mean the driver can't take a break whilst sitting in the loop? Test train operators using a train overnight in engineering hours
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Post by philthetube on Dec 28, 2020 12:39:15 GMT
I thought we're talking about the Battersea extension hmmm lol new thread started
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Post by grumpycat on Jan 3, 2021 20:23:51 GMT
The first test runs to visit Nine Elms and Battersea Power Station using ‘95 Stock were undertaken on 19 December, using 51597, these have continued over recent days. is there a video of this since it will be interesting to see a 95 stock down there
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Post by goldenarrow on Jan 3, 2021 23:09:03 GMT
The first test runs to visit Nine Elms and Battersea Power Station using ‘95 Stock were undertaken on 19 December, using 51597, these have continued over recent days. is there a video of this since it will be interesting to see a 95 stock down there The next best thing has appeared on Twitter. Click here if the link doesn't show up.
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Post by Dstock7080 on Jan 4, 2021 10:19:58 GMT
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Post by grumpycat on Jan 7, 2021 14:00:54 GMT
I do wonder is the passengers info system programmed to have these announcements now. Are they doing manual testing at this moment?
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Chris M
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Post by Chris M on May 13, 2021 15:45:12 GMT
ianvisits is reporting that from Sunday (16 May 2021) Kennington is moving from Zone 2 to Zones 1 and 2. This is because the Battersea extension stations will be in Zone 1 but without Kennington moving zones every journey from them to the rest of Zone 1 would require travelling via Zone 2.
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Post by goldenarrow on May 14, 2021 12:11:31 GMT
The latest Programmes & Investment Committee papers have cited ambitions to undertake Trial Operations for the Northern Line Extension in July with revenue earning service planned for September 2021.
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Post by AndrewPSSP on May 15, 2021 13:38:27 GMT
ianvisits is reporting that from Sunday (16 May 2021) Kennington is moving from Zone 2 to Zones 1 and 2. This is because the Battersea extension stations will be in Zone 1 but without Kennington moving zones every journey from them to the rest of Zone 1 would require travelling via Zone 2. So would that make it cheaper or more expensive? EDIT: Just read the article - it would make single fares cheaper
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Post by pgb on May 16, 2021 9:02:32 GMT
Out of curiosity - how much does a 'little' change like this actually cost?
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vincenture
Quiz tryhard, and an advocate for simpler, less complicated rail routes
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Post by vincenture on May 16, 2021 9:47:15 GMT
Would Elephant & Castle remain as Zones 1/2?
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Post by Chris L on May 16, 2021 10:58:33 GMT
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Post by norbitonflyer on May 16, 2021 12:44:30 GMT
Not a good design. At first glance, it looks like stations Iver to Reading are in Zone 6. Why is that area not white, like the area round Watford Junction?
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Post by goldenarrow on May 16, 2021 13:28:16 GMT
Not a good design. At first glance, it looks like stations Iver to Reading are in Zone 6. Why is that area not white, like the area round Watford Junction? Oyster cards are not valid at stations between Iver and Reading so there must be a separate colour distinction for that zone differing from other stations with special fares such as Watford Jct or Shenfield which do accept Oyster.
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DWS
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Post by DWS on May 19, 2021 20:13:13 GMT
Sunday 23 May 2021::No service will operate on the whole line due to power and signalling commissioning, Saturday 22 May : No service between Charing Cross and Kennington for Northern Line Extension Power Testing at Kennington.
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