Deleted
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Post by Deleted on Sept 17, 2005 19:16:59 GMT
I've noticed lately that a lot of structures in and around SSL stations now have plates with the letters "TL" on them. Are they similar to the plates seen elsewhere on the SSL, like the "MR" plates on the Met?
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Deleted
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Post by Deleted on Sept 17, 2005 20:45:30 GMT
The plates you refer are called "Bridge and structure plates" all bridges , signal gantries etc are numbered. I assume with all the new work going on and lots of contractors doing things , the need to locate structures has been highlighted with new plates.
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Deleted
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Post by Deleted on Sept 17, 2005 22:54:37 GMT
Ah - then I guessed correctly about their purpose. The "MR" plates I mentioned appear to convey the exact same information.
Why "TL" though? I saw these plates on the south side of the Circle - surely "DR" or "OS" would have been more logical?
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solidbond
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Post by solidbond on Sept 17, 2005 23:45:39 GMT
Ah - then I guessed correctly about their purpose. The "MR" plates I mentioned appear to convey the exact same information. Why "TL" though? I saw these plates on the south side of the Circle - surely "DR" or "OS" would have been more logical? I think, and I stress that it is only a guess, that they indicate the type of structure as well. My guess is that TL stands for 'Tunnel'. This is based on the fact that other plates show 'CW' (Covered Way), G (Gantry?). I have also seen 'V' and, IIRC, 'PC'. I thought 'V' could be viaduct, but that doesn't seem appropriate for where I have seen them. Anyone else got any ideas? Tom? |
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Post by citysig on Sept 18, 2005 12:09:11 GMT
Ah - then I guessed correctly about their purpose. The "MR" plates I mentioned appear to convey the exact same information. Why "TL" though? I saw these plates on the south side of the Circle - surely "DR" or "OS" would have been more logical? As Solidbond said, and the MR plates are, as far as I know, the original plates installed on the "Metropolitan Railway" long before they went to the current method of labelling. NR is using the same principles. Out my way, there are plenty of TE, TC and TWs followed by a number. Tunnel East, Tunnel Central, Tunnel West to label individual portals. |
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DWS
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Post by DWS on Sept 18, 2005 13:03:54 GMT
Ah - then I guessed correctly about their purpose. The "MR" plates I mentioned appear to convey the exact same information. Why "TL" though? I saw these plates on the south side of the Circle - surely "DR" or "OS" would have been more logical? I think, and I stress that it is only a guess, that they indicate the type of structure as well. My guess is that TL stands for 'Tunnel'. This is based on the fact that other plates show 'CW' (Covered Way), G (Gantry?). I have also seen 'V' and, IIRC, 'PC'. I thought 'V' could be viaduct, but that doesn't seem appropriate for where I have seen them. Anyone else got any ideas? Tom? PC = Pipe Crossing, i.e. Water Main, Gas Main etc. |
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Deleted
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Post by Deleted on Sept 19, 2005 2:25:13 GMT
I think, and I stress that it is only a guess, that they indicate the type of structure as well. My guess is that TL stands for 'Tunnel'. This is based on the fact that other plates show 'CW' (Covered Way), G (Gantry?). I have also seen 'V' and, IIRC, 'PC'. I thought 'V' could be viaduct, but that doesn't seem appropriate for where I have seen them. Anyone else got any ideas? Tom? PC = Pipe Crossing, i.e. Water Main, Gas Main etc. Yup, 'PC' certainly has to be something like that. I've seen them where small streams (water-courses) or large pipes cross the track. Before all these new plates appeared, bridges (& signal gantries etc) were numbered with 'MR' prefix on the Met between Baker St and Amersham, with 'U' on the Uxbridge branch, 'MLNE' on the Watford branch, and 'CM' on the Chesham Branch. But there have been problems in the Hillingdon area, where several new bridges were added when the A40 road was diverted, resulting in the original 'U21' bridge now having 'U21A' - 'U21B' - 'U21C' and 'U21D' just up the track from it! This new system seems to go for 'type of structure' rather than 'location of structure'.... and I've also seen 'RW' which I'm guessing is 'Retaining Wall' as the plate was fixed to just such a thing!  |
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Post by stanmorek on Oct 30, 2005 13:47:59 GMT
Hi first post here. Yes as some of you've already pointed out 'TL' does indeed stand for tunnel, usually the brick arch type.
The nameplates mentioned are asset ID plates made. As far as I know they're springing up as required by LU Engineering Standards.
Here's a list of letters I've come across myself (though not comprehensive),
MR = Metropolitan Railway bridges (a loose term on what a bridge is)
U = Uxbridge branch bridges
HC = H&C line bridges
EL = East London line bridges
D = District line bridges
S = Central line bridges (Hainault area)
A = Jubilee line bridges (Stanmore branch)
TL = Tunnel
CW = Covered Way
PC = Pipe Crossing
G = Girder
W = wall
SG = signal gantry
LGN = Lagoon
SP = station platform
V = Vent shaft
KR = disused viaduct (Hammersmith-Ravenscourt Pk)
No hard and fast rules here as I've seen a signal gantry named MR44A etc.
I also found out recently that some structures on the Piccadilly Uxbridge branch are prefixed D for District showing an interesting historical connection.
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Colin
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Post by Colin on Oct 31, 2005 1:58:34 GMT
I also found out recently that some structures on the Piccadilly Uxbridge branch are prefixed D for District showing an interesting historical connection. Hello, welcome - you'll find plenty of references on this forum too |
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