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Post by Deleted on Oct 6, 2007 19:19:20 GMT
I'm just curious as to what is the fastest service speed on the tube. The fastest I know is the Central at 52mph, beating the Met by 2mph.
I'm curious as to whether the Jubilee Line beats the 52mph speed on a regular basis in the extension.
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Post by Deleted on Oct 6, 2007 19:22:43 GMT
I thought the Mets could theoretically do 70mph, but still manage to get 60mph on the fast section?  |
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Post by c5 on Oct 6, 2007 19:25:37 GMT
I thought the Mets could theoretically do 70mph, but still manage to get 60mph on the fast section? They are restricted due to issues with the bogies I believe. The Chilterns can do 60mph over the MR sections I think. I also think that the central's top speed was lowered following the Chancery Lane motor/track altercation. I await an expert ;D ;D ;D |
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Post by Deleted on Oct 6, 2007 19:26:35 GMT
The Met is limited to 50mph because the A-stock:
(quote by tubeprune).
Indeed, the trains held together by Scotch tape used to do 100km/h which is a tad over 60mph.
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Post by Deleted on Oct 6, 2007 19:29:41 GMT
Top speed on the Central is.. 85kph. [about 52mph]
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Oracle
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Post by Oracle on Oct 6, 2007 19:34:56 GMT
Once again I regail the attempt on the D Stock METROLINER tour (21st September 1980) to wring the train's neck and achieve 70 mph, the then linespeed on the Met heading towards Amersham. I believe that we did achieve it! The driver certainly had the "pedal to the metal"!
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Post by Deleted on Oct 6, 2007 19:36:57 GMT
I've read about the 70mph D-stock as well which was not in normal service! I've also read about a 96TS (or whatever the Northern uses) on a test run achieved some insane speed on the downhill from High Barnet.
I'm more concerned here about the top service speed!
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Oracle
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Post by Oracle on Oct 6, 2007 19:39:28 GMT
A stock was at the time I think limited to 70, as were the DMUs. In service.
I can attest to what seemed like insane speed (and I was a motorcycle rider at the time) that had me agitated as heck as it was so frightening, when we were in the last car on the Northern Line 1959 Stock tour. We descended down from High Barnet I think it was, and into the tunnel at Warp Factor 9. I swore we were going to derail.
I have also been "concerned" a few times WB from Barons Court > Earl's Court, although used to love the 1938 Stock creaking and groaning on the Acton Town > Ravenscourt Park section.
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Post by Deleted on Oct 6, 2007 19:41:59 GMT
Ah, I see. The highest service speed that the tube ever had would be 70mph.
I also want to know...what's the top service speed in 2007? ;D
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Post by Deleted on Oct 6, 2007 19:43:22 GMT
Know once, I was being told a wonderful story by a Met man, that he was on a n/b Ammy fast, and had the thing off the clock, this was a few years ago, before they got refurbed!
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Post by Deleted on Oct 6, 2007 19:43:23 GMT
the met stopped those sort of speed limits in like 1997 they were doing the final refurb and when they looked at the wheel sets they found major problems like cracking bogies and old age first it was dropped from 70 to 60 and in 1997-98 it was dropped from 60 to 50 the a stock used to race the class 117 but the a stock normally would run faster as the 117's used to burn up and break down
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Oracle
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Post by Oracle on Oct 6, 2007 19:51:31 GMT
I would like to know what speed limit applied to the loco-hauled Marylebone-Nottingham express trains pre-mid 1966. More than 70? That said, there must have been tales pre-1961 of the electric Met loco-hauled trains?
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Tom
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Post by Tom on Oct 6, 2007 20:15:05 GMT
the met stopped those sort of speed limits in like 1997 they were doing the final refurb and when they looked at the wheel sets they found major problems like cracking bogies and old age first it was dropped from 70 to 60 and in 1997-98 it was dropped from 60 to 50 the a stock used to race the class 117 but the a stock normally would run faster as the 117's used to burn up and break down I think you'll find they were class 115's. |
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Post by Tom on Oct 6, 2007 21:09:44 GMT
The Met is limited to 50mph because the A-stock: (quote by tubeprune). I don't think so, unless the concession is related to emergency braking - the train performance bods quoted me a service brake rate of 1.0m/s/s wheras the standard states 0.7-0.9m/s/s. |
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metman
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Post by metman on Nov 2, 2007 17:51:43 GMT
The A stock is undoubtably the fastest operating stock on the network. The limit of 50 isn't always adhered to. I've been on Amersham-Harrow pm trains from Moor Park to Harrow and the driver-keen to end their shift has gone like the clappers, especially btw Northwood and Pinner, and there is that very straight section from Pinner to Harrow Nth Junction. Its good to see the old girls racing around sometimes-reminds me of when I was a kid!
Having said that, the 92ts is very powerful! With all bogies powered you can really feel the power as they leave the stations-especially on the Ruislip branch!
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Ben
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Post by Ben on Nov 2, 2007 20:01:42 GMT
Has the underground ever gone in for speed tests on the fast lines? I'm sure I read the NYCS has a similar practice. Would be a very interesting thing to hold a sweep-stake on!
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Post by happybunny on Nov 2, 2007 20:18:25 GMT
I got a 96 stock to about 58-60 mph between Canning Town and North Greenwich Westbound on several occasions (in service). Wish now I had taken a picture of the speedo!
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Post by Deleted on Nov 2, 2007 23:31:51 GMT
I think it depends what you mean by service speed. On the District the maximum is supposed to be 45mph, but I think you might see more than 52 on the Elm Park - Dagenham East run sometimes! The D stocks were built to do 60, and if half the tales I've heard are to be believed then 60 was easily achievable when they were new. I doubt the former Met line speed of 70 has ever been significantly surpassed.
Hopefully S stock will be capable of 70 - anyone know different?
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Post by trc666 on Nov 3, 2007 0:47:11 GMT
Wasn't there a claim in the past that somebody got a 1973 stock unit up to 75mph in weak field?
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metman
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Post by metman on Nov 3, 2007 0:52:07 GMT
It has been mentioned that someone has done a ton with A stock before! What can C stock do in theory? There was a plan to use 8 car C stocks on the District or Met lines wasn't there?
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Post by trc666 on Nov 3, 2007 1:06:00 GMT
Am I hearing right, a TON in an A stock?!!  |
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metman
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Post by metman on Nov 3, 2007 2:18:20 GMT
Yeah some bloke did a ton* btw Neasden and Willesden Grn! Its on a threat somewhere else! 90 was done on the up line from Chorleywood too. My mate was training to be a signal technician a few years back and he was in a cab and the t/op got to 70 odd! That was a few yrs back (but after the 50mph was enforced)!
*I'd like to see another Underground train do that!! Imagine a C stock screaming at 60mph!!
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Oracle
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Post by Oracle on Nov 3, 2007 5:36:15 GMT
As I leep memtioning, the D Stpck on the Metroliner tour was deliberately driven on the NB Met Fast towards Amersham with the "pedal to the metal" to achieve its design maxium of 70 mph..we got there eventually I gather!
I have been on one or two very high-speed, or so it seemed, runs on the Piccadilly between Osterley and Boston Manor. And then through Turnham Green. I can imagine the former section would be ideal for a "trash" with no prying eyes around to witness.
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Post by Colin on Nov 3, 2007 9:21:25 GMT
What can C stock do in theory? There was a plan to use 8 car C stocks on the District or Met lines wasn't there? C stocks are limited to 40mph - and there's a reminder sticker in the cab to enforce it  As for an 8 car C stock; I can't see it - the retarders on the EP brake would be out of sync for starters..... |
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Post by Deleted on Nov 3, 2007 12:07:09 GMT
I was under the impression a 1992 stock could still do 100kph (or 62.5 mph) while in manual. I know the ATO max speed is 85 kph (52.8 mph), although I've heard the MSS speed on a 92 will allow it to be driven up to 103 kph!!!!!
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Tom
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Post by Tom on Nov 3, 2007 12:54:21 GMT
They can - the 85Km/h restriction is enforced via the ATO equipment on the train and the MSS will still appear as 100 on the speedo.
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Post by superteacher on Nov 4, 2007 12:30:30 GMT
I remember some drivers hacking the 62TS between Mile End and Stratford eastbound - have heard that 60mph was sometimes done on this section.
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Post by superteacher on Nov 4, 2007 12:33:07 GMT
They can - the 85Km/h restriction is enforced via the ATO equipment on the train and the MSS will still appear as 100 on the speedo. So when in coded manual, it will still give a target speed of 100kph then? I though that when they lowered it to 85kph, they also changed the ATP codes to reflect this. |
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Tom
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Post by Tom on Nov 4, 2007 20:55:13 GMT
100km/h is the target speed for both ATO and CM operation - the difference is that in ATO the train will never accelerate to 100.
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