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Post by Deleted on Feb 23, 2011 13:12:13 GMT
Just had a quick look at the latest pickies of the new bit from Dalston Junction to Highbury, looks fantastic. (London's best bit of new railway yet?)
Just wanted to ask if anyone knows why they chose slab track (or whatever the sleeper system is) over "conventional" ballast?
It seems with other main line rail upgrades, e.g. Thameslink, they are not choosing slab track and keeping to the conventional system.
Just wondering if there was any particular reason.
Thanks!
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Post by ducatisti on Feb 23, 2011 13:49:18 GMT
Generalising enormously (I am not a PW expert), slab track is more expensive, more rigid (so wears faster and is noisier for a given speed), and generally more complex.
I think it's more a case that there must be a specific reason for it. I'd guess there might be a weakness in the supporting structure that is cheapest to cure that way (bearing in mind that LO will be slower than the chunnel link and so is less of a noise issue).
Or they are just planning to really annoy modellers...
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Post by andypurk on Feb 23, 2011 16:48:17 GMT
Just had a quick look at the latest pickies of the new bit from Dalston Junction to Highbury, looks fantastic. (London's best bit of new railway yet?) Just wanted to ask if anyone knows why they chose slab track (or whatever the sleeper system is) over "conventional" ballast? It seems with other main line rail upgrades, e.g. Thameslink, they are not choosing slab track and keeping to the conventional system. Just wondering if there was any particular reason. Thanks! The route is actually ballasted most of the way to Highbury & Islington. It is only the section just north of Dalston Junction station which is slab track. Presumably due to the tunnels under Kingsland High Street and Boleyn Road. Much of the first phase of the ELL is also slab track, it is more expensive to lay in the first place, but then cheaper to maintain than ballasted track. |
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Post by Deleted on Feb 23, 2011 21:18:05 GMT
Think it is done in most cases on ELL for reasons of track fixity. Helps with maintaining tight stepping distances and gauging
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