Train GraphicClick on the map to explore geographics
 
I need help
FAQ
Emergency
About
Waterloo Campaign
Travel & transport from BBC stories as at 05:15 25 Jan 2022
- What Covid tests do I still need to travel abroad?
- Covid travel tests axed in England and Scotland for fully vaccinated
Read about the forum [here].
Register [here] - it's free.
What do I gain from registering? [here]
 28/01/22 - FOSBR AGM - ONLINE
29/01/22 - National Bus Meetings
04/02/22 - Call for Evidence GBR closes
04/02/22 - SMK award entries close

On this day
25th Jan (2014)
FGW announces link with Singapore Airlines (link)

Train RunningCancelled
05:00 Oxford to Didcot Parkway
05:20 Didcot Parkway to Oxford
PollsThere are no open or recent polls
Abbreviation pageAcronymns and abbreviations
Stn ComparatorStation Comparator
Rail newsNews Now - live rail news feed
Site Style 1 2 3 4
Next departures • Bristol Temple MeadsBath SpaChippenhamSwindonDidcot ParkwayReadingLondon PaddingtonMelksham
Exeter St DavidsTauntonWestburyTrowbridgeBristol ParkwayCardiff CentralOxfordCheltenham SpaBirmingham New Street
January 25, 2022, 05:23:28 am *
Welcome, Guest. Please login or register.

Login with username, password and session length
Forgotten your username or password? - get a reminder
Most recently liked subjects
[275] Night Riviera to be reduced for eight weeks due to engineering...
[198] Devon and Cornwall resignalling
[39] Trains told to get rid of torrent of 'Tannoy spam'
[36] Portishead Line reopening for passengers - ongoing discussion
[20] Brighton Belle - rebirth thread
[16] Peak time Barnstaple services to be extended to/from Axminster...
News: A forum for passengers ... with input from rail professionals welcomed too
 
   Home   Help Search Calendar Login Register  
Pages: [1]
  Print  
Author Topic: Tisbury, loop  (Read 370 times)
grahame
Administrator
Hero Member
*****
Posts: 35471



View Profile WWW Email
« on: December 01, 2021, 03:56:46 am »

Why does it always seem to take so l-o-n-g to get past Tisbury?  Quite apart from the station stop, there seems to be a boring dwell at the loop - double frustrating if the you add in other dawdles of London to Exeter trains around and in Wiltshire ... from 1L33, the 12:20 from Waterloo, today, as read off Real time trains (this link will expire in a week):
* 3 minutes "pathing allowance" at Andover
* 2.5 minutes "pathing allowance" on the approach to Tunnel Junction
* 4 minutes in the station in Salisbury
* 4.5 minutes gap between arrival and departure from "Tisbury Loop"

From Open Train Times, the setup at Tisbury looks different to that at other places trains can pass each other in the same region:



To my untutored eye, it's almost as if Tisbury is set up to hold a freight train or an ECS (Empty Coaching Stock) off to one side - in either direction - and then have a passenger train, for which perhaps a faster schedule is important, run straight through.  The wait in the example train above suggests that, whist it can be used to pass passenger trains, it's far from ideal for that.  Have I read that right?
Logged

Coffee Shop Admin, Vice Chair of Melksham Rail User Group, and on the board of TravelWatch SouthWest.
grahame
Administrator
Hero Member
*****
Posts: 35471



View Profile WWW Email
« Reply #1 on: December 01, 2021, 04:55:27 am »

1F18 - the Portsmouth to Cardiff train that leaves Salisbury just ONE MINUTE before the arrival of the service from Waterloo - is an example of a train with less slack across Salisbury. I took a look at this train just wondering if it could hang on for a couple of minutes. Longer stations stops are:
* 4 minutes at Southampton
* 2 minutes at Salisbury
* 2 minutes at Westbury
There are no passing loop waits and no pathing allowances in there - but there are two "engineering allowances" of a minute each at Warminster and at Bradford-on-Avon.  Further north, 2 minutes at Bath Spa and 7 minutes at Bristol Temple Meads, and a minute engineering at Bath Spa and 30 seconds pathing on the approach to Bristol.

There are other issues in moving the slack around. We need to remember that from Tunnel Junction into Salisbury Station, and from Salisbury Station to Wilton Junction, the trains (under current layout / signalling) share the same track. Also that the "minimum interchange time" between trains at Salisbury is 5 minutes, though cross platform (2 to 3 or vice versa) or along platform 4 (rear train to train in front) perhaps a minute or two less could be managed in practice.
Logged

Coffee Shop Admin, Vice Chair of Melksham Rail User Group, and on the board of TravelWatch SouthWest.
PhilWakely
Transport Scholar
Hero Member
******
Posts: 1673



View Profile
« Reply #2 on: December 01, 2021, 08:03:01 am »

The loop at Tisbury was very much an afterthought following the singling of the line west of Wilton. The powers that be had intended the line to be single all of the way between Gillingham (Dorset) and Wilton, but this proved disastrous for timekeeping. As the land adjacent to the Down platform at Tisbury had already been sold off, they could not put the loop in the station itself. In the current timetable, a number of westbound trains are scheduled to wait in the loop.
Logged
bradshaw
Transport Scholar
Hero Member
******
Posts: 1100



View Profile
« Reply #3 on: December 01, 2021, 08:25:15 am »

Templecombe is another one where the double track should continue into the station not start a few metres to the west.
However any future changes will wait until the decision is made about electrification (or not) and the replacement for the 159s.
Logged
Bob_Blakey
Transport Scholar
Hero Member
******
Posts: 610


View Profile
« Reply #4 on: December 01, 2021, 03:06:05 pm »

...As the land adjacent to the Down platform at Tisbury had already been sold off, they could not put the loop in the station itself. ...

The former site of the down platform is part of a hardstanding surrounding a large commercial building. I am sure if the will was there the current owners could be persuaded to sell back a few metres width to allow reinstatement of a platform (& footbridge if that is deemed necessary). Every time I use the SWR» (South Western Railway - about) route through Tisbury the commercial site seems bereft of any activity.
Logged
GWR 158
Sr. Member
****
Posts: 120


View Profile Email
« Reply #5 on: December 01, 2021, 06:10:41 pm »

What does an 'engineering allowance ' actually mean?
Logged
grahame
Administrator
Hero Member
*****
Posts: 35471



View Profile WWW Email
« Reply #6 on: December 01, 2021, 08:17:31 pm »

What does an 'engineering allowance ' actually mean?

I believe it's time sprinkled into schedules to allow trains to catch up if they've had to go slower (so take longer) through engineering works (temporary speed restrictions)
Logged

Coffee Shop Admin, Vice Chair of Melksham Rail User Group, and on the board of TravelWatch SouthWest.
Do you have something you would like to add to this thread, or would you like to raise a new question at the Coffee Shop? Please [register] (it is free) if you have not done so before, or login (at the top of this page) if you already have an account - we would love to read what you have to say!

You can find out more about how this forum works [here] - that will link you to a copy of the forum agreement that you can read before you join, and tell you very much more about how we operate. We are an independent forum, provided and run by customers of Great Western Railway, for customers of Great Western Railway and we welcome railway professionals as members too, in either a personal or official capacity. Views expressed in posts are not necessarily the views of the operators of the forum.

As well as posting messages onto existing threads, and starting new subjects, members can communicate with each other through personal messages if they wish. And once members have made a certain number of posts, they will automatically be admitted to the "frequent posters club", where subjects not-for-public-domain are discussed; anything from the occasional rant to meetups we may be having ...

 
Pages: [1]
  Print  
 
Jump to:  

Powered by MySQL Powered by PHP Powered by SMF 1.1.2 | SMF © 2006-2007, Simple Machines LLC Valid XHTML 1.0! Valid CSS!
This forum is provided by a customer of Great Western Railway (formerly First Great Western), and the views expressed are those of the individual posters concerned. Visit www.gwr.com for the official Great Western Railway website. Please contact the administrators of this site if you feel that the content provided by one of our posters contravenes our posting rules (email link). Forum hosted by Well House Consultants

Jump to top of pageJump to Forum Home Page