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| What is 'Engineering Allowance' for? 27/10/2012 at 10:51 #36956 | |
Underwood
746 posts |
Hello all, Whilst writing my timetable for Cambridge, and it's something I've noticed when doing other TTs, what is Engineering Allowance supposed to be for? I thought it was used for engineering hot spots, where a TSR is likely to be maybe or some form of restriction. However I can't get why the numbers seem to vary. An XC at 9am say will have a 1 minute engineers allowance at Ely North Junction, but the one before and after it will not, nor will any other train as if it will only affect this service. It applies elsewhere too, or can have either 2 or 1 minutes, or none at all. Ones with 1 minute are adjusted in the timetable so the next arrive or pass location is a minute later. For one off allowances it seems it's only used to add a minute to the timetable, but isn't this what Pathing Allowance is used for? In some cases, an extra minute to one service at one station without a [1],(1) or <1>, but then a minute less is added a stop or two down the line regaining the pattern. I think I had this once or twice on the North London Line, and there didn't appear to be a reason for holding it back for a minute is the line ahead is clear, and then it arrives a minute early. The same goes for just half minutes too. Signed, A confused timetabler :S Log in to reply |
| What is 'Engineering Allowance' for? 27/10/2012 at 11:26 #36957 | |
58050
2650 posts 
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Engineering Allowance in WTTs are shown in '[x]' square brakets around them for things like temporary speed restrictions or reduction in linespeeds due to crossovers etc. Pathing allowances in WTTs are shown in '(x)' curved brakets & are recovery allwances for regularting purposes. I tend to find however the timings between points in WTTs are only altered if it is Pathing Allowances have been marked against a particular service, but if Engineering Allowance is shown on a service there is no additional minutes added to the next timing point. Because TSRs aren't in place permanently or else they would be permanent speed restrictions.
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| What is 'Engineering Allowance' for? 27/10/2012 at 12:50 #36962 | |
postal
5193 posts
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James It is all available on line for you at the Network Rail website. Under what is known as the "Rules of the Route" Network Rail show a lot of detailed instructions about how a TT must be constructed. Not only is there a listing of the mandatory engineering allowances which must be included in every train's TT, there is also a full set of instructions about how much headway there must be between trains, a listing of how long must be allowed between one train leaving and another entering a platform at every main station, usable platform lengths etc. etc. If you go to the Network Rail Rules of the Route Menu and scroll down the list, towards the bottom are a number of links marked "Operational Rules Artwork ALL2011.pub". The small print beside each link tells you the year for which the rules applied. Click on the link you want which takes you to another menu page which allows you to select the part of the network for which you wish to see the details. If you click on the main button rather than the "commentary" button, Section 5 of the document should contain everything you need. “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 |
| What is 'Engineering Allowance' for? 27/10/2012 at 14:36 #36970 | |
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TimTamToe
656 posts |
" said:JamesAnd extremely useful it is too. A great help for me while writing my Brighton TT Log in to reply |
| What is 'Engineering Allowance' for? 28/10/2012 at 10:49 #36994 | |
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Underwood
746 posts |
I see, thanks for explaining what they are both required for 58050, but an example would be 1L26, which has a [1] at Ely North Jn, but also has 1 minute added to the next timing location, which is the stop at Ely. 1L28 (an hour later going the same way) has no engineering allowance, and is given the standard 2 minutes to Ely. One would assume then that the [1] is given for pathing over Ely North Jn and maybe headway allowance, rather than 1 minute for a TSR. Postal - I would check but I don't know how to use it, are you supposed to be able to click on the buttons on the .pub files? I see the areas and commentary boxes, but no matter what one I click, it just highlights the text :S Log in to reply |
| What is 'Engineering Allowance' for? 28/10/2012 at 11:45 #36995 | |
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TimTamToe
656 posts |
" said:double click on the area box, (and click ok if error box comes up) and the pdf should open up. Gareth Log in to reply |
| What is 'Engineering Allowance' for? 28/10/2012 at 12:07 #36996 | |
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postal
5193 posts
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It should be a click on the button and the document opens. The menu is a .pdf and sometimes takes a while to appear. The actual RotR document is also a .pdf so again it can take a while before anything appears. Have you anything in the security applications on your system or browser that could interfere with Acrobat and stop if passing instructions to open a new page in the browser? Does your system use Acrobat Reader or one of the more lightweight .pdf readers like Foxit? The Menu Page requires PScript5.dll which may not have been installed if you are using one of the lightweights. (Gareth typed and posted while I was still thinking!). “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: 28/10/2012 at 12:08 by postal Log in to reply |
| What is 'Engineering Allowance' for? 28/10/2012 at 13:13 #36997 | |
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Late Turn
696 posts |
" said:I see, thanks for explaining what they are both required for 58050, but an example would be 1L26, which has a [1] at Ely North Jn, but also has 1 minute added to the next timing location, which is the stop at Ely. 1L28 (an hour later going the same way) has no engineering allowance, and is given the standard 2 minutes to Ely. Pathing time is indicated (1) rather than [1] (the latter being, as being discussed, engineering allowance), so it's (probably) not for that. I think the others are <1> (performance allowance?) and {1} (adjustment allowance), but happy to be corrected. Further west, the discrepancy between successive Stansted - B'ham trains is noticeable - just a minute here and there, but it's a bit of a puzzle sometimes (and a nuisance too, when you're otherwise able to work off a standard pattern for most of the day!). Log in to reply |
| What is 'Engineering Allowance' for? 28/10/2012 at 14:55 #36998 | |
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Colourlight
117 posts |
On the Ely-Peterborough line a large amount of time is added to the schedules of overnight trains. This is for any planned Single Line working that used to be a regular occurance. However, with the increase in Container traffic, line closures for Possessions is becoming less and less frequent and has now reached the point where they could become a thing of the past. The thinking now is to do more track work during the weekend and none during the week. Even weekend work on a Saturday night is limited because the line must remain open until the early hours to permit Engineering trains access to and from Whitemoor as required
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