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| East Midlands Parkway 12/10/2012 at 06:30 #36320 | |
glyndavies
8 posts |
Hi, I noticed yesterday, that at the country end of East Midlands Parkway the two station starters at ST 4497 (Down Fast) and ST 4497 CA (Down Slow). Can anybody elaborate on the numbering system? Log in to reply |
| East Midlands Parkway 12/10/2012 at 07:25 #36322 | |
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Late Turn
699 posts 
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Without checking the signal numbers (so relying on your description of the positions!), both signals apply to the Down Fast. ST4497CA is a co-acting signal provided (quite awkwardly) as there'd otherwise be insufficient time for a Driver at linseed to sight ST4497 - both signals should, as the term co-acting implies, display the same aspect at all times. The signal applying to the Down Slow is right on the end of the platform, and is a rather small structure! It too has a co-acting signal, located on the opposite side of the Up Slow. Log in to reply |
| East Midlands Parkway 12/10/2012 at 07:32 #36323 | |
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glyndavies
8 posts |
Thsanks. It was difficult to tell from the car park Log in to reply |
| East Midlands Parkway 12/10/2012 at 13:28 #36346 | |
jc92
3685 posts
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" said:Without checking the signal numbers (so relying on your description of the positions!), both signals apply to the Down Fast. ST4497CA is a co-acting signal provided (quite awkwardly) as there'd otherwise be insufficient time for a Driver at linseed to sight ST4497 - both signals should, as the term co-acting implies, display the same aspect at all times.there is a similar arrangement at worksop east with the main signal sitting on the platform, and a co acting signal sat in the 6ft. according to a couple of ex WP drivers this is due to sighting on approach from worksop west due to the canopy. on a side note, how are these coacters repeated on a panel? i assume if one or the other fails, both go to red, and only one indicator is provided on the panel for the main signal, rather than one for each signal? "We don't stop camborne wednesdays" Log in to reply |
| East Midlands Parkway 12/10/2012 at 15:49 #36356 | |
GeoffM
6376 posts |
" said:Hi,As noted, the CA is co-acting. The ST gives the origin and destination for that segment of line. I can't think what S is right now, but T is almost certainly Trent. Regardless of the prefix, the numbering usually continues rather than resetting, so at the end of the ST segment might be ST6543 but the next signal might be TX6545. This is because train describer berth IDs are only four characters so the ST/TX is not included in the identity, so duplicate numbers would be a problem in a single TD. " said: on a side note, how are these coacters repeated on a panel? i assume if one or the other fails, both go to red, and only one indicator is provided on the panel for the main signal, rather than one for each signal?This area is on a Westcad. I can't remember specifically how CAs are handled, but while the signaller might get a generic fault indication, the technician would know exactly what had failed. SimSig Boss Log in to reply |
| East Midlands Parkway 12/10/2012 at 16:32 #36359 | |
58050
2659 posts
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S could stand for Syston, so the section would be Syston - Trent.
Log in to reply The following user said thank you: GeoffM |
| East Midlands Parkway 12/10/2012 at 18:11 #36377 | |
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Horgy
33 posts |
As luck would have it, I have the perfect photo here!
JGH Log in to reply |
| East Midlands Parkway 12/10/2012 at 19:58 #36385 | |
Simdmuk
155 posts |
58050 is correct ,ST is Syston-Trent . He's a photo of the stumpy ST4499 on the Down slow.
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| East Midlands Parkway 21/11/2012 at 13:27 #37903 | |
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ramillies19
4 posts |
" said:" said:The co-acting signal at Worksop is for the shunt movements of Nottingham services (going back to Central Trains days). If a train came in formed with a 170 plus other unit, there is no gangwayed access from one end of the train to the other. Since there is no walking route to allow changing ends after passing over the crossing, this co-acting signal allows the driver to change ends in the platform, observe the signal has cleared and propel the train over the crossing. It then waits to crossover into the other platform as per normal arrangements.Without checking the signal numbers (so relying on your description of the positions!), both signals apply to the Down Fast. ST4497CA is a co-acting signal provided (quite awkwardly) as there'd otherwise be insufficient time for a Driver at linseed to sight ST4497 - both signals should, as the term co-acting implies, display the same aspect at all times.there is a similar arrangement at worksop east with the main signal sitting on the platform, and a co acting signal sat in the 6ft. according to a couple of ex WP drivers this is due to sighting on approach from worksop west due to the canopy. The co-acting signals at East Midlands Parkway were required for sighting purposes due to the line curvature and station canopies. Pete Clay Log in to reply |
| East Midlands Parkway 21/11/2012 at 15:44 #37921 | |
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jc92
3685 posts
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" said:" said:Doubt it- the co-acter had been present at worksop east a long time before 170s were even designed or RHL trains had been introduced. they may have later fulfilled that function, but it wasnt the original reason" said:The co-acting signal at Worksop is for the shunt movements of Nottingham services (going back to Central Trains days). If a train came in formed with a 170 plus other unit, there is no gangwayed access from one end of the train to the other. Since there is no walking route to allow changing ends after passing over the crossing, this co-acting signal allows the driver to change ends in the platform, observe the signal has cleared and propel the train over the crossing. It then waits to crossover into the other platform as per normal arrangements.Without checking the signal numbers (so relying on your description of the positions!), both signals apply to the Down Fast. ST4497CA is a co-acting signal provided (quite awkwardly) as there'd otherwise be insufficient time for a Driver at linseed to sight ST4497 - both signals should, as the term co-acting implies, display the same aspect at all times.there is a similar arrangement at worksop east with the main signal sitting on the platform, and a co acting signal sat in the 6ft. according to a couple of ex WP drivers this is due to sighting on approach from worksop west due to the canopy. "We don't stop camborne wednesdays" Log in to reply |