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Post by nickf on Jun 11, 2012 8:29:37 GMT
I have read that the earlier tube lines had the stations at a higher level than the lines either side of them so that gravity helped to slow down trains as they approached a station uphill and assisted as the trains went downhill on leaving, thus saving power and also brakes.
Is this practice still used with modern tube lines?
edited to try to improve clarity.
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Post by ianvisits on Jun 11, 2012 10:00:27 GMT
Is this practice still used with modern tube lines? Yes - have a look at the Jubilee Line and you can see this in practice. |
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Post by nickf on Jun 11, 2012 10:26:01 GMT
Excellent! Thanks a lot. Just got back from reading your site, Ian - really very very interesting: thanks for that too.
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Post by Deleted on Jun 11, 2012 12:34:47 GMT
It was another inovation on the Victoria line to have rising and falling gradients.
I will have to look it up agian, but I recall about this being done on the Piccadilly line where there was a signal cabin between stations, at the north end of the line, and the train would stop to drop off and pick up signalmen and there was a rise and fall.
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mrfs42
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Post by mrfs42 on Jun 11, 2012 12:38:31 GMT
It was another inovation on the Victoria line to have rising and falling gradients. How could that be an innovation when the Central London had been constructed in said style some decades prior? Are you thinking of Weston Street on the C&SL? |
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Post by Deleted on Jun 11, 2012 12:56:46 GMT
It was another inovation on the Victoria line to have rising and falling gradients. How could that be an innovation when the Central London had been constructed in said style some decades prior? Are you thinking of Weston Street on the C&SL? I think that was Weston Street. Yes, the Victoria line was not the first to use that system, but it did go back to that idea of using gradients. |
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Post by v52gc on Jun 11, 2012 13:23:46 GMT
I read somewhere if I recall correctly that on the Vic they employed a system whereby leaving a station the train would go down a gentle incline all the way until a steep climb just before the next platform; either that or the other round.
This is as opposed to having gradients just on leaving or arrival at platforms used by the previous lines.
I can't remember the title but it's a little book about the Victoria Line from the 60s by Garbutt (?) I think. It had little diagrams to illustrate this. I can't get to the book right now as its packed away in a box for a house move...
Edit to add: it was "How the Underground Works" by Garbutt, 1963 (so it might not be how things were built in the end on the Vic)
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Post by revupminster on Jun 11, 2012 19:00:58 GMT
How the Underground works records the "Hump" profile on the trunk section of the Central line of 1 in 60 out and into stations and on the southern end of the Northern line 1 in 30. The "saw tooth" gives 1 in 30 out of a station with a gradual rise to the next station. It was intended for the Victoria line but space limitations limited it's use.
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Post by superteacher on Jun 11, 2012 19:58:02 GMT
It's especially apparent on the Central line station in the central area where the platforms were extended in the 1930's.
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Post by brigham on Jul 16, 2012 13:59:38 GMT
Interestingly, Baker Street station is quite the opposite; trains drop into it, and then climb again on leaving. I've always thought it was to get more headroom within the station area, to disperse the steam and smoke, although I could be wrong.
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Post by Harsig on Jul 16, 2012 15:03:31 GMT
Interestingly, Baker Street station is quite the opposite; trains drop into it, and then climb again on leaving. I've always thought it was to get more headroom within the station area, to disperse the steam and smoke, although I could be wrong. More likely extra depth below street level was required to accommodate the over-line passenger subways at each end of the station. |
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Post by brigham on Jul 16, 2012 15:15:07 GMT
I'd love to see a diagram of Baker St. station. Is there one around?
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mrfs42
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Post by mrfs42 on Jul 16, 2012 20:45:42 GMT
I'd love to see a diagram of Baker St. station. Is there one around? I doubt you'll find one in the public domain. Indeed - but the 1921 Met Gradients are in the public domain. I think I webbed them up ages ago, but as I'm on my phone, I can't search for them. |
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Post by crusty54 on Jul 16, 2012 21:30:40 GMT
I'd love to see a diagram of Baker St. station. Is there one around? I doubt you'll find one in the public domain, in three dimensions it's a massive site on nine levels from memory including the station, substation, police station and offices with lots of non-public areas the majority of which I worked in over the years. With Chiltern Court included (worked in there too years ago as LT executives had apartments there at one time ) the site covers an entire block. I've never actually seen the Fireplan for the site but that would of course show pretty much every nook and cranny. Even with the layouts it took one whole day to track down all the air conditioning units on the site It's much the same with all the big stations that had lifts in the days before escalators. Lucky enough to have had a couple of cab rides on the Victoria Line. Gradients can be seen. Bit different with the Jubilee Line Extension where level platforms are needed for the platform doors |
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Ben
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Post by Ben on Jul 16, 2012 22:00:33 GMT
Might fireplans for an individual level be displayed on that level somewhere? Sometimes these appear in a public area, especially near alarms or other equipment.
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