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Electrification over flat crossings
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ElectroSoldier
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There is a good example for you on Allerton chord
One end has 3rd rail and OHLE over a flat jn the other end the OHLE goes both ways over a flat jn.
starts at 31:38
One end has 3rd rail and OHLE over a flat jn the other end the OHLE goes both ways over a flat jn.
starts at 31:38
kilonewton
Member
Burke Rd is complete, the level crossing at Glenhuntly Rd is in the planning stages prior to removal.
Still two more tram/train level crossings at Glenferrie Road Kooyong and Riversdale Road Camberwell not yet planned to be removed.
Painfully slow on a train over all those crossings, but as they’re adjacent to stations, it’s not too bad normally.
I believe that the OHL is energised at the voltage for the tram or train voltage interlocked to the boom gates. ie when they’re down for a train to come through it’s at 1500V, otherwise it’s at 600V
https://goo.gl/maps/7TgZCPGSWyb3STJE9
From Google maps in the centre of Helsinki on the tram network - a nice example of OHL crossing at 90 degrees. Funny I never thought about the logistics of it until I saw this thread.
Tram. so low voltage. I suppose the very middle bit isnt a conductor?
lets not even get started on trolleybus 'points'!
themiller
Member
But it would be more reliable - 'Do it once, do it right'!
A £200m difference for a little bit of reliability is a huge price to pay.
themiller
Member
A little bit of reliability? It'd remove the conflict between the two lines thus increasing the paths available on the busy ECML. It'd also (if the second line were to be wired) remove the design difficulties associated with designing and installing the wiring which would, no doubt, need a permanent speed restriction over the crossing.
civ-eng-jim
Member
The flat crossing was only renewed the other week....Give it 20 years before thinking about alternatives.
themiller
Member
Start thinking about it now and it may be ready when needed!
How many extra paths would be created on the ECML to London through provision of a flyover? (Clue: if it’s more than none, think again).
themiller
Member
Sorry, I meant across!
There’s spare paths available across now. At least one an hour in each direction, and often two.
Class 170101
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But apparently the East Midlands franchise isn't allowed to have a second Lincoln to Nottingham path each way per hour.
The Flat Crossing does seem to hardwire the timetable though.
Fairly sure that it is Newark that’s the issue - the franchise spec not only specifies no more than 1tph each way, but also that the Up and Down trains are timed to cross there to minimise the number of movements across the flat crossing. There’s other paths though - two freights across in some hours, IIRC. Whether £200m is justified by the improvements for Lincolnshire is a whole new discussion, or whether it’d be more cost effective to divert some freight via another route to free up more paths.
The A46 there is always clogged up. In a sane world they would build 1 structure, for a 2nd road carriageway, the Newark castle railway and while they are at it a flyover over the A46 where the great north road (The one that comes in past the sugar works) crosses. The current roundabout always get clogged up by the level crossing.
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