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Post by bringbackcrouchhil on Dec 21, 2011 14:03:57 GMT
Why do the tracks on the East London Line not have railway sleepers, instead they have two stumps? What is the advantage of the stumps?
JC
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Post by eurostarengineer on Dec 21, 2011 15:17:17 GMT
Less maintenance required, they're a lot cheaper and rarely go out of gauge/void etc
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Post by ducatisti on Dec 21, 2011 15:47:37 GMT
<assumption> are we talking about blocks in the ballast <assumption> out of interest, how do they not go out of gauge? It seems counter-inuitive that they would not be more prone to spreding
I recall an Ian Allan article somewhere noting the French love of blocks and equating it, like yellow headlights, with Gaullism being placed above science, and pointing out a recently re-laid piece of TGV track being laid with conventional sleepers.
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Deleted
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Post by Deleted on Dec 21, 2011 19:01:57 GMT
No these are not blocks, the trackwork has no ballast at all, its all just concrete
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Post by Deleted on Dec 21, 2011 19:25:14 GMT
Less maintenance required, they're a lot cheaper and rarely go out of gauge/void etc So why is the DLR such a rough ride? |
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Post by Deleted on Dec 21, 2011 20:44:18 GMT
Less maintenance required, they're a lot cheaper and rarely go out of gauge/void etc So why is the DLR such a rough ride? Wheel profiles are different to get round those sharp curves, but the compromise is the hunting on straight track |
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castlebar
Planners use hindsight, not foresight
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Post by castlebar on Dec 21, 2011 21:35:26 GMT
I know the service is slow, but sleeping cars???
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Post by eurostarengineer on Dec 22, 2011 15:16:20 GMT
So why is the DLR such a rough ride? Wheel profiles are different to get round those sharp curves, but the compromise is the hunting on straight track The wheel profiling (conicity/tapering) isn't greatly different from any other stock. The articulated bogie design was the whole point of getting around tighter curves as it gives you a pretty damn tight turning circle. DLR is a pretty rough ride because of the concrete... Ballast settles in with the track therefore absorbing a lot of the movement a train makes as it passes over. Obviously cant have shed loads of ballast on a purpose built bridge for railways as it weighs too much. |
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