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Post by naz on Mar 2, 2016 15:42:16 GMT
just recently I noticed that the old no11 crossover has been removed from Epping station and plain lined , the conductor rails had not been put back when and why has this been done ? which begs the question why they retained at all ? and the single red stop lamps so far up the line is this for engineers use?.
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North End
Beneath Newington Causeway
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Post by North End on Mar 2, 2016 15:55:46 GMT
just recently I noticed that the old no11 crossover has been removed from Epping station and plain lined , the conductor rails had not been put back when and why has this been done ? which begs the question why they retained at all ? and the single red stop lamps so far up the line is this for engineers use?. The sections of line in advance of the fixed red lamps is part of the overrun for the station platforms. It is this length of track which allows Epping to have a high approach speed compared to a dead-end terminus. I don't know why the points have now been removed, however as a guess since the track here forms part of the overrun (as well as occasionally used during engineering works or for transfers to/from Epping Ongar Railway) they are required to be maintained in some form of condition, perhaps there has come a time when their age/condition has become such that it's cheaper to remove them. Or, some other works were taking place in the area and the opportunity was taken to do it when equipment was already at site. Those are the two obvious possibilities.
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Deleted
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Post by Deleted on Mar 4, 2016 21:34:43 GMT
Points on the main have to be maintained every 6 weeks, points that do not effect the main i.e sidings, depots are maintained every 12 weeks.
But for example a set of points that is in a depot or sidings but if the train SPAD'ed the signal protecting a junction and the train would end up on the main then its classed as a main line set and must be done every 6 weeks
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rincew1nd
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Post by rincew1nd on Mar 4, 2016 22:16:19 GMT
Could they not simply be clipped and scotched, then left? Would seem to be a more cost-effect way of doing things!
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Deleted
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Post by Deleted on Mar 4, 2016 22:45:55 GMT
They would still need to check that the points would fail if the switch moved again every 6 weeks so its still a waste of resource and even though they don't physically move the points would still need to be routinely changed every 10 years again more waste of resources. Cheaper all round to plain line points which are rarely / never used
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Deleted
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Post by Deleted on Mar 5, 2016 8:09:41 GMT
It was removed 30/3/15.
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Post by stapler on Mar 5, 2016 8:20:03 GMT
Why would they need replacing every 10 years?
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Deleted
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Post by Deleted on Mar 5, 2016 10:11:35 GMT
Reliability and safety and to make sure everything is still within the manufactures guide lines for wear and tolerances. On newer point machines they are changed every 1,000,000 moves or 10 years whichever is the sooner, on some components in the machines though they are changed bit more frequent at 250,000 and 500,000 cycles but the whole thing is changed at 1,00,000. Depot and siding points which are on a 12 week maintenance cycle are changed every 20 years or the 1,000,000 operations.
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rincew1nd
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Post by rincew1nd on Mar 5, 2016 10:49:01 GMT
Whilst I can understand the need for a lifespan for points in regular use, how often are these used? Somewhere between never and once a year? A derogation seems cheaper than removal in this case!
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Deleted
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Post by Deleted on Mar 5, 2016 16:31:09 GMT
Even in a de-commissioned state the points would still need to be looked at there maintenance cycle to make sure everything is still in place i.e scotch and clip
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Post by naz on Mar 7, 2016 16:02:11 GMT
Hi-Thanks for the info, looks like its only a matter of time before the next crossover is it 10 or 12 ( I am in a library )is removed also, as it must be just as old as no-11 . Now I know why the single red stop lights are so far up the line, if sand drags had been put there behind the twin red lights would the line speed need to be reduced ?
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Deleted
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Post by Deleted on Mar 7, 2016 23:49:07 GMT
Epping is classed as terminal station so it would have the same speed as say West Ruislip and Ealing Broadway
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Deleted
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Post by Deleted on Mar 8, 2016 0:02:04 GMT
Epping is classed as terminal station so it would have the same speed as say West Ruislip and Ealing Broadway I'm actually not sure I agree with you here. Certainly the last time I was there, the final block marker board was at the platform entrance, where the target speed drops to 0. By contrast, at West Ruislip and Ealing Broadway there is a block marker board part way down the platform and your speed is checked down all the way to the fixed red lights. But this kind of speed control (not sure of the precise terminology here) is, I believe, still absent at Epping, you can approach the FRLs at the speed you hit the platforms. I'm not sure what that is, but I believe it to be faster than the speed at which you pass the last block marker board at West Ruislip.
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North End
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Post by North End on Mar 8, 2016 4:00:20 GMT
Epping is classed as terminal station so it would have the same speed as say West Ruislip and Ealing Broadway I'm actually not sure I agree with you here. Certainly the last time I was there, the final block marker board was at the platform entrance, where the target speed drops to 0. By contrast, at West Ruislip and Ealing Broadway there is a block marker board part way down the platform and your speed is checked down all the way to the fixed red lights. But this kind of speed control (not sure of the precise terminology here) is, I believe, still absent at Epping, you can approach the FRLs at the speed you hit the platforms. I'm not sure what that is, but I believe it to be faster than the speed at which you pass the last block marker board at West Ruislip. Yes Epping is indeed a lot faster than most dead-end platforms because of the long over-run, this applies to both platforms as Platform 1 has the former Ongar branch whilst Platform 2 has the former east siding. The crossovers are also specifically laid out for fast running, both entering and leaving. West Ruislip also has a small over-run allowing a slightly faster approach, the slowest terminal platforms on the Central are Ealing Broadway and Woodford bay. Entering Epping is one place you'd not want to be doing ATO speeds if driving manually, simply because all the liability is on the driver if you do overrun. Whilst not unsafe because of the long over-run, it would go down to the driver, whereas in ATO it wouldn't. When the ATO came in High Barnet Platform 1 had a surprisingly high entry speed (around 20mph) despite being a dead-end and having a passenger walkway beyond the end. With the recent 95 stock brake performance issues a 10 mph TSR has now been implemented.
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Post by patrickb on Mar 21, 2016 19:03:49 GMT
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Deleted
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Post by Deleted on Mar 21, 2016 19:15:51 GMT
They have been trying for quite a few years to get parts and make the old frame work again not sure what progress it is at currently
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DWS
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Post by DWS on Mar 21, 2016 19:32:35 GMT
The signal cabin at Epping will not work any points or signals. The whole of the Central line is controlled from Wood Lane .
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Post by patrickb on Mar 21, 2016 23:37:56 GMT
I see, so what does it mean when CHT say that the signal cabin will be fully operational again? Will it be more of a display piece with operational leavers and diagrams etc..
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Deleted
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Post by Deleted on Mar 22, 2016 5:02:14 GMT
Thats all it can be it will never operate any real equipment on the operational railway again
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