Deleted
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Post by Deleted on Jul 8, 2014 7:04:50 GMT
When was the last Westinghouse taking out of use on the Central Line?
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hobbayne
RIP John Lennon and George Harrison
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Post by hobbayne on Jul 9, 2014 11:08:38 GMT
1996 I believe.
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Post by superteacher on Jul 9, 2014 17:01:19 GMT
It was definitely 96 - 97. The line was all ATP by 97.
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Deleted
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Post by Deleted on Jul 9, 2014 18:15:59 GMT
Thanks!
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Post by jamesb on Jul 15, 2014 7:17:38 GMT
At Woodford on the westbound (as an example) the signal has the 'route indicator' above which displays the big arrow, then the signal with 3 aspects, the below that another box with a display that is never lit up. Does anyone know what that is for?
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Deleted
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Post by Deleted on Jul 15, 2014 8:28:23 GMT
I've been told it's the "route secure" visual. If the signal should fail, the display will show "RS" indicating to the T/Op that a route is locked and that it is safe to proceed, although it presumably cannot show which route is set. Apparently the points can be locked from the control room, although how this is done I don't know - it presumably couldn't be done in the event of a points failure, but could be in the event of a signal failure. Obviously it saves having to scotch and clip the points. As I understand it, there is no such visual on any colour light signal which has no points between it and the next signal. I imagine it only displays RS if all the points between it and the next signal are locked, but I don't know. P.S.: The starter at Woodford westbound is 2-aspect  (The wrong-road starter is 3-aspect but it doesn't have a route indicator) |
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Post by railtechnician on Jul 15, 2014 10:55:13 GMT
I've been told it's the "route secure" visual. If the signal should fail, the display will show "RS" indicating to the T/Op that a route is locked and that it is safe to proceed, although it presumably cannot show which route is set. Apparently the points can be locked from the control room, although how this is done I don't know - it presumably couldn't be done in the event of a points failure, but could be in the event of a signal failure. Obviously it saves having to scotch and clip the points. As I understand it, there is no such visual on any colour light signal which has no points between it and the next signal. I imagine it only displays RS if all the points between it and the next signal are locked, but I don't know. P.S.: The starter at Woodford westbound is 2-aspect (The wrong-road starter is 3-aspect but it doesn't have a route indicator) I don't know about Central line signalling since the 1990 resignalling. However, in general terms points are always laying correctly and locked before a route reading over them can be cleared, all the points in the route have to be thrown and/or locked in order for the signal to be cleared for the route. This is normal, there is not a separate means to 'lock the points from the control room'. In the event of an apparent signal failure for a route reading over points the signal operator will not give the train operator permission to proceed under rule unless the route is secured. The signal operator will operate the 'route secure' key and if all the points are laying correctly and locked the route secure visual at the signal will illuminate. If the RS visual does not illuminate then the train will remain where it is pending the attendance of a signal lineman to investigate the failure. A lineman never 'knows' the cause of a failure until attending the call whether s/he is told it is a signal failure or not. |
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hobbayne
RIP John Lennon and George Harrison
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Post by hobbayne on Jul 16, 2014 10:43:47 GMT
If the signaller can not for some reason get the route secured visual to be displayed, they can authorise the T/op to proceed under the White route locking procedure.
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Deleted
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Post by Deleted on Jul 16, 2014 11:11:32 GMT
If the signaller can not for some reason get the route secured visual to be displayed, they can authorise the T/op to proceed under the White route locking procedure. How does that work? |
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Deleted
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Post by Deleted on Jul 16, 2014 18:41:21 GMT
The last cabin to close on the Central Line was Hainault - 21/4/2001.
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Colin
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My preserved fire engine!
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Post by Colin on Jul 25, 2014 23:00:30 GMT
If the signaller can not for some reason get the route secured visual to be displayed, they can authorise the T/op to proceed under the White route locking procedure. On the Central line only, the control room can tell if the route is set & locked as it will show up in bold white on their signalling diagram - this is known as "white route locking" and trains can be authorised to proceed by the signaller on the basis that they have proof the route is set & locked. |
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Tom
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Signalfel?
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Post by Tom on Jul 26, 2014 17:11:28 GMT
I've been told it's the "route secure" visual. If the signal should fail, the display will show "RS" indicating to the T/Op that a route is locked and that it is safe to proceed, although it presumably cannot show which route is set. RS Signs work in conjunction with the route indicator (if present) at the signal. In the event of the RS facility being required the T/Op will see both a route indicator for the desired route and an RS Sign. |
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(The wrong-road starter is 3-aspect but it doesn't have a route indicator)
