Deleted
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Post by Deleted on Apr 10, 2008 12:03:05 GMT
Just a quick one.
The stn starters on both the east and westbound local roads at Ravenscourt Park remain red until a train approaches.
What is the need for this arrangement?
Thanks in advance.
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Post by happybunny on Apr 10, 2008 12:12:43 GMT
To stop through trains (i.e. piccs or District out of service (sometimes piccs use the local)) bombing through the area and approaching Hammersmith (25 PSR) at 40/45 mph I think, not 100% sure tho.... ok it's just a guess really!
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Tom
Administrator
Signalfel?
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Post by Tom on Apr 10, 2008 19:25:37 GMT
It's a hangover from when Ravenscourt Pk was closed on a sunday, to ensure that they were speed checked through the station when non-stopping.
There are two track circuits in the platform, each with their own timing section; the first is for 15 seconds and the second for 4.5 (if I remember it correctly - it may be the other way round).
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Deleted
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Post by Deleted on Apr 10, 2008 21:38:20 GMT
yer it would sound right as cannon street on the w/b is the same didnt think the e/b was approach controlled on well you live and learn shows how often it plays up
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Deleted
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Post by Deleted on Apr 10, 2008 22:54:22 GMT
Thanks Tom. I'd heard a few 'possibles' since asking around but what you've explained has been the only one that has made logical sense.
Thanks, and much appreciated.
By the way, in what era was Ravenscourt closed on sundays??
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North End
Beneath Newington Causeway
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Post by North End on Apr 12, 2008 15:48:41 GMT
It's a hangover from when Ravenscourt Pk was closed on a sunday, to ensure that they were speed checked through the station when non-stopping. There are two track circuits in the platform, each with their own timing section; the first is for 15 seconds and the second for 4.5 (if I remember it correctly - it may be the other way round). On the eastbound it is: First track circuit occupied for 4.5 seconds with the second unoccupied OR Second track circuit for 15 seconds. The westbound is slightly different as follows: First track circuit occupied for 4.5 seconds with the second unoccupied OR Second track circuit for 4.5 seconds. TC 22/76 and 23/76 refer. I believe similar applies at Covent Garden, Bow Road (?), and most probably some other locations around the system, where stations are no longer closed at certain times. |
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Deleted
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Post by Deleted on Apr 13, 2008 15:38:24 GMT
bow road does not have approach controlled signals
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Post by happybunny on Apr 13, 2008 16:19:37 GMT
Cannon St does ... bloody annoying they are as well, especially on the WB.. you have to actually stop the train at the starter for about 5 seconds before the signal clears! Seems a bit silly as when the station is closed.. if you actually stop for a matter of seconds this could encourage people on the train to try and open the doors and get out... where if you run through slowly not stopping though this wouldn't happen
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Deleted
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Post by Deleted on Apr 13, 2008 16:38:13 GMT
Cannon St does ... bloody annoying they are as well, especially on the WB.. you have to actually stop the train at the starter for about 5 seconds before the signal clears! If you slow down halfway down the platform it normally clears. |
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Post by happybunny on Apr 13, 2008 17:21:28 GMT
Thanks for the tip Jim ill try next time
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Deleted
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Post by Deleted on Apr 13, 2008 21:02:10 GMT
the 15 sec one doesnt work and hasnt done since the BTR when they crushed the cable
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Post by Tubeboy on Apr 15, 2008 23:04:36 GMT
I notice on Solidbond's DVD, the repeater for the W/B starter doesnt clear until the train is almost on top of it.
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Post by railtechnician on Apr 16, 2008 16:54:56 GMT
Cannon St does ... bloody annoying they are as well, especially on the WB.. you have to actually stop the train at the starter for about 5 seconds before the signal clears! Seems a bit silly as when the station is closed.. if you actually stop for a matter of seconds this could encourage people on the train to try and open the doors and get out... where if you run through slowly not stopping though this wouldn't happen I think that scenario applies if you have exceeded the required speed through the platform so you are caught by the 4.5 sec time relay. the other thing about these circuits is of course that you must pull up to the starter in order to get the signal to clear if is remains at danger on approach as you need to pickup the delta track circuit. I recall the non-stopping on Sunday at Barbican in the late 1970s where we installed this type of speed control circuitry. I expect these days the deltas are gradually being replaced with position detectors. |
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Post by railtechnician on Apr 16, 2008 16:57:39 GMT
It's a hangover from when Ravenscourt Pk was closed on a sunday, to ensure that they were speed checked through the station when non-stopping. There are two track circuits in the platform, each with their own timing section; the first is for 15 seconds and the second for 4.5 (if I remember it correctly - it may be the other way round). What I recall about Ravenscourt Park is having to go and adjust the timing on the flashing amber lights because it was on the Picc even though it was a DR maintenance area! |
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Deleted
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Post by Deleted on Apr 16, 2008 17:35:08 GMT
the flashing amber lights which look like school crossing lights are at turnham green they controlled from a central heating timer it has to be adjusted every time they change the clocks
cannon street does not have a delta circuit the track circuit infront of the starter is tiny its about half a carriage length this is how it should work the train enters the platform dropping the first platform track this is then in the pick up for the 15 sec JR and this is in the selection for the starter if that fails then of course already mentioned the other way of making the starter clear is via the 4 1/2 sec relay once the last platform track has dropped
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Post by happybunny on Apr 16, 2008 17:37:11 GMT
Those flashing lights.. do they ever work? Iv never seen them on
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Deleted
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Post by Deleted on Apr 16, 2008 17:58:50 GMT
Those flashing lights.. do they ever work? Iv never seen them on I've seen them on about 3 times in the last 5 years and I do all dead lates and nights, so in theory I should see them on most of the time. |
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Deleted
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Post by Deleted on Apr 16, 2008 20:24:46 GMT
every train that is suppose to stop at turnham green picc the lights should be on but they proberly need relamping by now either that all the timer has packed up
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Post by happybunny on Apr 17, 2008 0:35:53 GMT
So technically.. since the lights seem to not work, the picc drivers would have a good reason/excuse to NEVER stop at Turnham Grn   |
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Post by Dstock7080 on Apr 17, 2008 13:05:51 GMT
By the way, in what era was Ravenscourt closed on sundays?? Looking back at Underground Maps, the change happened between the Nov 1989 issue and April 1990. |
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