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Moorgate & Met.Widended Lines you tube
IMHO what the Circle Line desperately needs is some kind of relief
location where trains can be regulated. 4 tracks for Circle use *only* where you can do bifurcating operation and/or recess trains and/or overtake if necessary are all contribute positively to service regulation. ((The point about overtaking is taking one train out of the flow when trains are bunched, re-inserting it when the bunch has passed.)) Edgware Road is out of the frame these days since the broken Circle, there is almost nowhere else where anything can be done. Someone pointed out on some forum recently - here ? District Dave ? I forget - that Kings Cross and Victoria are very busy stations with long dwell times and oppurtunities - albeit expensive ones - have been lost/impossible in recent/planned rebuild to put in 4 platforms. The advantage cited was both locations are away from all the junctions, and diametrically opposite each other, offering 2 regulation locations. Clearly neither would happen now. But if you slightly displaced the suggested regulation locations clockwise around the Circle, you could use *Barbican* and South Ken. The latter has I think room for 4 tracks still within the existing structure/cutting, although it would need some shifting around of trackside kit. Thus a more sensible use of the redundant ''widened lines'' going east of Farringdon would be to diverge from the Met-City to 4 platforms through Barbican and converge back to 2 through lines through Moorgate. I suggest there is enough space to do this but would need a certain amount of significant work east of Barbican to achieve. Ideally for bifurcating working you need an island for each direction with both platform faces going the same way - neither South Ken nor Barbican would offer this, so any trains being recessed or tipping out would cause passenger to have to use crossways, but I suggest overall this is an advantage : it train X is in the existing platform train Y is stuck in tunnel behind. With 2 platform tracks, Y might get in allowing passengers to cross to X while Y recesses. Overall it keep passengers moving even if one train does not. The whole point of this suggestion is to address the fundamental weak point of the Circle - it has zero resilience. If you have 4 track locations it allows sort of elasticity for the operators. Far too subtle a point for uk.railway ''but we've always done it his way'' die hards of course. -- Nick |
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