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London Transport (uk.transport.london) Discussion of all forms of transport in London. |
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On 19/12/2015 08:39, Roland Perry wrote:
And while not GN's fault Northstowe Parkway station is a year (or more, depending on which broken promise you count) late, and perhaps something to do with co-operation from Abellio the franchise commitment to roll out "Franchise wide" smart ticketing has been re-jigged as "Royston and further south". That's nothing. The Thameslink-2000 project is at least 18 years late. -- Clive Page |
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In message , Roland Perry
wrote: It currently has four "single lead" junctions (a, b and c). Only the Peterborough direction has a full two-track junction. https://goo.gl/maps/3JziEjRARYF2 So it's like this: Ely ------------------------------------ Peterborough \ Ely ---------a-------------------------- Peterborough \ * \ b------c--------------- Kings Lynn \ \ \ -------------- Kings Lynn \ d------------------ Norwich \ ----------------- Norwich Actually, a+c is a single lead junction, as is a+d. b is just a single track junction. A "single lead" junction consists of a crossover between the two main tracks, a turnout from one track to the branch, and points merging the two tracks of the branch. As is fairly obvious, places like "*" are a monster bottleneck. Actually, even worse is when the points just to the left of "a" fail in the diagonal, rather than the straight position. (I've not seen it happen in real life, but I have in simulation.) If anyone wants to experiment with how this layout works, let me put in a plug for SimSig Cambridge (http://www.simsig.co.uk). -- Clive D.W. Feather | Home: Mobile: +44 7973 377646 | Web: http://www.davros.org Please reply to the Reply-To address, which is: |
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