Deleted
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Post by Deleted on Jan 31, 2009 2:04:15 GMT
I noticed today wads of new red cables between Blackfriars and Mansion House, does anyone know what this is for? I've noticed the new LED signal bulbs between Mansion House and Aldgate East but I doubt these need new wiring.
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Colin
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My preserved fire engine!
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Post by Colin on Jan 31, 2009 6:50:40 GMT
I noticed today wads of new red cables between Blackfriars and Mansion House, does anyone know what this is for? I would imagine it's connected with the upcoming closure of Blackfriars - the work they're talking about doing there sounds very destructive, so I'm thinking it's gonna be pretty much by-passed for the duration of the closure. I've noticed the new LED signal bulbs between Mansion House and Aldgate East but I doubt these need new wiring. You can't miss the LED signals can you?! - pity next weeks traffic circular says they're being installed from the 2nd February (Aldgate East to Victoria), and that depots will be told which ones have been done each night via the service manager. So either whoever is changing them over has the got the wrong end of the stick, or whoever did the traffic circular entry has - makes me think of the drinks in a brewery scenario!  |
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Tom
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Post by Tom on Jan 31, 2009 12:03:57 GMT
As there will be no access to Blackfriars, the relay rooms are being evacuated and the equipment is being resited to Mansion House IMR.
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Post by Deleted on Jan 31, 2009 15:39:51 GMT
You can't miss the LED signals can you?! - pity next weeks traffic circular says they're being installed from the 2nd February (Aldgate East to Victoria), and that depots will be told which ones have been done each night via the service manager. So either whoever is changing them over has the got the wrong end of the stick, or whoever did the traffic circular entry has - makes me think of the drinks in a brewery scenario! It's great all this joined up thinking on LU isn't it. I do like the new signals though, they are certainly more prominent, you can see the glow of signals from around bends in many cases. As there will be no access to Blackfriars, the relay rooms are being evacuated and the equipment is being resited to Mansion House IMR. That explains it, thanks Tom. |
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Deleted
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Post by Deleted on Jan 31, 2009 16:43:23 GMT
I have always wondered how many of the "signal failures" are just broken bulbs. Can we see a reduction of signal failures with the replacement of old style bulbs for LEDs?
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Post by Deleted on Jan 31, 2009 17:41:23 GMT
In Paris "Métro", old signals used to have two sets of lamps, "normal" and "emergency". There was a manual switch at the foot of the signal, and train operators were entitled to commute the switch in case of a "black" (i.e. no lamp illuminated) signal.
This had disappeared BEFORE led signals were introduced.
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Colin
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Post by Colin on Jan 31, 2009 20:00:10 GMT
I have always wondered how many of the "signal failures" are just broken bulbs. Can we see a reduction of signal failures with the replacement of old style bulbs for LEDs? Probably not to be honest. Signal failures that affect the service are more often than not actually track circuit failures. What that means is something like: - Scaling (metal bridging an insulated block joint)
- Equipment within the track circuit failing (such as a relay or broken wire)
- Points failing to lock correctly or register as correctly locked in position
- Metal obstruction across both running rails (creating the illusion of a train in section)
- Broken rail
I'm sure there's more but hopefully you get the idea. Bulb failure isn't all that common; especially as filament bulbs have two filaments so that it appears really dim before failing completely - so if a dim bulb is reported & dealt with promptly....... |
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Post by upfast on Jan 31, 2009 23:01:53 GMT
I have always wondered how many of the "signal failures" are just broken bulbs. Can we see a reduction of signal failures with the replacement of old style bulbs for LEDs? In my experience it is a track wire or train stop problem more than anything. Then a problem with the frame in the IMR, such as lever not moving properly. |
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Post by myoldmansamushroom on Feb 1, 2009 17:13:00 GMT
Scaling's definitely a common one, as are broken wires and points failing.
There are occasionally lever issues in IMRs, such as over-puffed levers or levers not puffing at all (in effect the previous route clears again without being selected), but these certainly aren't as common as the reasons above.
Mind you, there was that locking bar failure at Northfields the other day, but that specific failure has happened only three times in twenty years according to my learned sources.
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Tom
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Post by Tom on Feb 1, 2009 17:58:40 GMT
It wasn't a locking bar that failed - it was the part that transmits the lever movement to the locking bar.
Whatever happens, it's fairly rare, probably even less frequent than the figures suggested.
Back to signal failures, don't forget dry blood and High Resistances as common faults.
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Post by maxtube on Feb 1, 2009 18:57:17 GMT
On American level crossings and signalling, LEDs are brighter but don't last as long!
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Deleted
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Post by Deleted on Feb 2, 2009 21:26:08 GMT
As there will be no access to Blackfriars, the relay rooms are being evacuated and the equipment is being resited to Mansion House IMR. Oh dear god its all going to go wrong isnt it? |
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Ben
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Post by Ben on Feb 2, 2009 23:34:52 GMT
London Underground; a new paradgm of optimism.
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