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Post by russe on Jan 21, 2006 15:18:27 GMT
On the approach to a converging junction, is a repeater's yellow aspect illuminated when the path is not set? And does the answer to this question depend on whether the signals concerned are automatic?  Russ |
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Post by Deleted on Jan 21, 2006 15:44:27 GMT
On the approach to a converging junction, is a repeater's yellow aspect illuminated when the path is not set? And does the answer to this question depend on whether the signals concerned are automatic? If the signal that is protecting the junction is at danger, the repeater on the same post will not show any aspect. If the signal is off and the signal it is repeating is at danger it will show a yellow aspect. If the signal is off and the signal it is repeating is showing a clear or caution aspect, it will show a green aspect. Also this junction, as any other would be protected by semi automatic signals. |
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Post by russe on Jan 21, 2006 16:13:30 GMT
Excellent, MA; clear and precise. How would you define semi-automatic?
Russ
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Post by Harsig on Jan 21, 2006 17:42:48 GMT
Excellent, MA; clear and precise. How would you define semi-automatic? Russ Not automatic. Alternatively any signal that can be controlled by a signalman (we won't mention controlled X signals) |
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Post by q8 on Jan 21, 2006 17:50:51 GMT
Excellent, MA; clear and precise. How would you define semi-automatic? Russ Not automatic. Alternatively any signal that can be controlled by a signalman (we won't mention controlled X signals) X signals??? Good lord Harsig are there such things? I have never seen one. How can you define a controlled automatic signal? Like a mermaid it's niether one thing nor the other. |
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Post by Deleted on Jan 21, 2006 18:45:19 GMT
a semi has letter codes that dont begin with A but you dont count signals with X as the last letter
EC10 would be a semi
A900 would be a auto
say ECX691 drivers have to treat this as a semi but it is actually a automatic and wired up as a auto
any signal which starts with PNX is a signal protecting a possession
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Post by citysig on Jan 21, 2006 20:05:45 GMT
CONTROLLED X signals??? Good lord Harsig are there such things? I have never seen one. How can you define a controlled automatic signal? Like a mermaid it's niether one thing nor the other. Both Paddington stations on the Circle / H&C have eastbound station starting signals which are controlled X Signals. There are others. The traditions or boundaries are moved to suit the purpose correctly. Quite often such signals perform the tasks of both auto and semi-auto. |
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Post by q8 on Jan 21, 2006 20:22:59 GMT
You know seeing this reminded me of a repeater that used to be on the northbound Bakerloo [now wobbly] on the approach to Wembley Park. This must have had a very dark yellow lens in it as in certain light conditions it looked RED. It was up high on a gantry and I forget the number.
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Colin
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My preserved fire engine!
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Post by Colin on Jan 22, 2006 0:39:46 GMT
Both Paddington stations on the Circle / H&C have eastbound station starting signals which are controlled X Signals. Indeed, I was held there by C5 last weekend because the platforms at Edgware Road were full. I was going to call the controller as I could see the next signal was green - but he called me first to explain. I must admit I was quite impressed at not having to ask ;D ;D |
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Post by c5 on Jan 22, 2006 1:47:16 GMT
I will forward that to my guvnor! ;D  ;D |
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Post by Harsig on Jan 22, 2006 2:00:22 GMT
CONTROLLED X signals??? Good lord Harsig are there such things? I have never seen one. How can you define a controlled automatic signal? Like a mermaid it's niether one thing nor the other. Both Paddington stations on the Circle / H&C have eastbound station starting signals which are controlled X Signals. There are others. Indeed there are. The ones I was thinking of were the first I ever came across which are the westbound starters at Ruislip and Hillingdon and the eastbound starter at Ickenham. In general they work just like any other automatic signal but the signalman has a switch he can operate to hold the signal at Danger should he so choose. You'll notice that all the examples mentioned so far are not only X signals but also station starting signals and the facility is provided mostly so that trains can be held in the platform when it is known that they would most likely be otherwise detained at the first controlled signal which in this situation will be between stations. |
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Post by Deleted on Jan 22, 2006 18:27:35 GMT
And IIRC the facility to hold MUX738, MWX746 and MUX743 (the starters at Ruislip w/b, Hillingdon w/b and Ickenham e/b) was installed when the automatic signalling on the branch was renewed in the 1990s.
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Post by citysig on Jan 22, 2006 19:08:03 GMT
Indeed, I was held there by C5 last weekend because the platforms at Edgware Road were full. I was going to call the controller as I could see the next signal was green - but he called me first to explain. I must admit I was quite impressed at not having to ask ;D ;D The only problem with using them - as I found out on the very first morning of them being commissioned - is that it's all very well holding a train at Paddington because Edgware Road is full, but you have no way of telling what's behind the train at Paddington. You can only see the platform tracks at Paddington and no further back. I was, as I say, the very first signal operator to use them, and on that very morning I suggested to the manager sat behind me, that some sort of indication should be given so we had some idea if we had another train behind. As C5 will confirm, there hasn't been much progress in this. Only been 9 years though ;D |
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Post by c5 on Jan 22, 2006 20:46:36 GMT
I am led to belive that there is a plan  to install a camera showing the dot matrix at Paddington, to the cctv monitor at Edgware Road. The line controllers already have this and if there not too busy, they can look for you or the Paddington Supervisor. |
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Post by Deleted on Jan 23, 2006 0:26:23 GMT
Excellent, MA; clear and precise. Thanks!  How would you define semi-automatic? A signal where the Stick relay doesnt automatically re engergise after the passage of a train. Therefore the SR will only re energise when the lever in the signal cabin / IMR is either reversed or restroked. |
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Post by Deleted on Jan 23, 2006 9:08:53 GMT
not true MA stick relays (SR) are only found where u still have signalmen operating cabins with levers (not push button) a stick relay prevents a semi being worked as a auto in the above areas but where u have IMR's this is not the case and for instance Bromley - by - bow to upminster all the IMR's can be left in auto through by the means of King Switch (automatic working) these are in barking and upminster cabins if the switch is enabled then the relevent levers in the IMR stays reverse until its taken out of king (disabled) and the signal has been cancelled
In a IMR in the city where the is no facilty for king switches you could leave the air off the interlocking machine and the signals would then work as a automatic with no problems
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;D
to install a camera showing the dot matrix at Paddington, to the cctv monitor at Edgware Road. The line controllers already have this and if there not too busy, they can look for you or the Paddington Supervisor.
