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| Signal D714 18/12/2012 at 16:54 #39347 | |
Ray
211 posts |
What am I missing with signal D714 on the Tay Bridge ? Sometimes it changes to green no bother and the next time it stays red no matter what I do.
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| Signal D714 18/12/2012 at 17:05 #39348 | |
andyb0607
260 posts 
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Only one train at a time is allowed on the centre part of the bridge. So the signal will be held at red if you've already set the route in the opposite direction. Log in to reply |
| Signal D714 18/12/2012 at 17:14 #39349 | |
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AndyG
1835 posts |
" said:Only one train at a time is allowed on the centre part of the bridge.I believe was a directive from The Board of Trade when the bridge was rebuilt after the Tay Bridge diaster, to minimise the wind loading on the replacement bridge. I can only help one person a day. Today's not your day. Tomorrow doesn't look too good either. Log in to reply |
| Signal D714 18/12/2012 at 18:09 #39350 | |
jc92
3629 posts |
" said:" said:the bridge wasnt rebuilt, its a completely new separate structure built next to the original the original supports sit next to the current bridgeOnly one train at a time is allowed on the centre part of the bridge.I believe was a directive from The Board of Trade when the bridge was rebuilt after the Tay Bridge diaster, to minimise the wind loading on the replacement bridge. "We don't stop camborne wednesdays" Log in to reply |
| Signal D714 18/12/2012 at 18:22 #39352 | |
postal
5190 posts |
" said:" said:I'm sure you are right, Andy. If I remember correctly I went through my library and found the relevant reference which I quoted on the old Forum. The Rules of the Plan now gives weight restriction as the limiting factor. Dundee Central Junction instructions include "Owing to weight restrictions on the Tay Bridge, the High Girders section of the bridge must be treated as a Single Line." The Sectional Appendix forbids double heading for the same reason. If there is a second loco DIT, it must have barrier wagons giving a minimum length of 60m. between locos.Only one train at a time is allowed on the centre part of the bridge.I believe was a directive from The Board of Trade when the bridge was rebuilt after the Tay Bridge diaster, to minimise the wind loading on the replacement bridge. “In life, there is always someone out there, who won’t like you, for whatever reason, don’t let the insecurities in their lives affect yours.” – Rashida Rowe Log in to reply |
| Signal D714 18/12/2012 at 18:23 #39353 | |
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postal
5190 posts |
" said:" said:Not strictly true as a lot of the girders and steelwork from the old bridge were used in the reconstruction." said:the bridge wasnt rebuilt, its a completely new separate structure built next to the original the original supports sit next to the current bridgeOnly one train at a time is allowed on the centre part of the bridge.I believe was a directive from The Board of Trade when the bridge was rebuilt after the Tay Bridge diaster, to minimise the wind loading on the replacement bridge. “In life, there is always someone out there, who won’t like you, for whatever reason, don’t let the insecurities in their lives affect yours.” – Rashida Rowe Last edited: 18/12/2012 at 18:24 by postal Log in to reply |
| Signal D714 18/12/2012 at 19:31 #39358 | |
Peter Bennet
5360 posts |
As William McGonagall wrote An Address to the New Tay Bridge BEAUTIFUL new railway bridge of the Silvery Tay, With your strong brick piers and buttresses in so grand array, And your thirteen central girders, which seem to my eye Strong enough all windy storms to defy. And as I gaze upon thee my heart feels gay, Because thou are the greatest railway bridge of the present day, And can be seen for miles away From North, South, East or West of the Tay On a beautiful and clear sunshiny day, And ought to make the hearts of the “Mars” boys feel gay, Because thine equal nowhere can be seen, Only near by Dundee and the bonnie Magdalen Green. Beautiful new railway bridge of the Silvery Tay, With thy beautiful side-screens along your railway, Which will be a great protection on a windy day, So as the railway carriages won’t be blown away, And ought to cheer the hearts of the passengers night and day As they are conveyed along thy beautiful railway, And towering above the Silvery Tay, Spanning the beautiful river shore to shore Upwards of two miles and more, Which is most beautiful to be seen Near by Dundee and the bonnie Magdalen Green, Thy structure to my eye seems strong and grand, And the workmanship most skilfully planned; And I hope the designers, Messrs Barlow and Arrol, will prosper for many a day For erecting thee across the beautiful Tay. And I think nobody need have the least dismay To cross o’er thee by night or by day, Because thy strength is visible to be seen Near by Dundee and the bonnie Magdalen Green. Beautiful new railway bridge of the Silvery Tay, I wish you success for many a year and a day, And I hope thousands of people will come from far away, Both high and low without delay, From the North, South, East and West, Because as a railway bridge thou art the best; Thou standest unequalled to be seen Near by Dundee and bonnie Magdalen Green. And for beauty thou art most lovely to be seen As the train crosses o’er thee with her cloud of steam; And you look well, painted the colour of marone, And to find thy equal there is none, Which, without fear of contradiction, I venture to say, Because you are the longest railway bridge of the present day That now crosses o’er a tidal river stream, And the most handsome to be seen Near by Dundee and the bonnie Magdalen Green. Vogon poetry is mild in comparison. Peter I identify as half man half biscuit - crumbs! Log in to reply |
| Signal D714 18/12/2012 at 19:38 #39359 | |
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Peter Bennet
5360 posts |
" said:What am I missing with signal D714 on the Tay Bridge ? Sometimes it changes to green no bother and the next time it stays red no matter what I do.Presumably the question is answered by the comments of others here - added to Wiki as it was an omission. Peter I identify as half man half biscuit - crumbs! Log in to reply |
| Signal D714 18/12/2012 at 19:44 #39361 | |
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Lardybiker
771 posts |
Just as well it wasn't Paula Nancy Millstone Jennings otherwise we'd all be in trouble.....
Log in to reply The following users said thank you: Steamer, GoochyB |
| Signal D714 19/12/2012 at 10:52 #39372 | |
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Ron_J
329 posts |
" said:" said:The Tay Bridge high girders restriction being discussed here was only imposed in 1995. A project is ongoing to relax it for certain classes of train, which will involve some alterations to the interlocking at Dundee SC.Only one train at a time is allowed on the centre part of the bridge.I believe was a directive from The Board of Trade when the bridge was rebuilt after the Tay Bridge diaster, to minimise the wind loading on the replacement bridge. Log in to reply The following user said thank you: postal |