Hi GWR2006, Thanks for your reply,
The objectives for redoubling were very simple, and were:
^ To improve performance along the route to 92% PPM‡ for the existing service pattern; and
^ To enable the introduction of an hourly service, also at 92% PPM
So what was the performance and exisitng service pattern at the time of the re-doubling?
IIRC▸ once the timetable was 'padded' the performance was on target.
The hourly (or better) service is most important at peak hours - at those times, in the morning the predominant traffic is east bound, and in the evening it is west bound. One of the major restricitions of the single line was that you could not have more that one train on the single line section travelling in the
same direction. This could have easily been rectified with intermediate signalling
The justification for the investment was that improved performance on the Cotswolds Line directly leads to improved performance in the Thames Valley, and especially between Reading and Paddington. Simulation was carried out on six iterative options, all intended to deliver the 92% PPM performance level, using a route and timetable simulation model called RailSys. The options tested were:
Option 1: Evesham remodelling;
Option 2: A dynamic loop centred on Evesham;
Option 3: Options 1 & 2 plus dynamic loop at Honeybourne;
Option 4: Option 3 plus Moreton remodelling;
Option 5: Redoubling from Evesham to Moreton; and
Option 6: Option 5 plus Redoubling from Ascott to Charlbury.
Option 6 gave the best result weighing up benefits and costs and was chosen. The budget was then negotiated between Network Rail and DfT» and value-engineered to achieve the desired output within the funds awarded. I recall the figure went up a little before being fixed at ^67 million. The scope was not fixed by the funding; the scope led the financing.
Why wasn't it an option to re-double Honeybourne - West of Pershore and Ascott - East of Hanborough? You would easily achieve youe 92% PPM target and if that was done (with Coombe & Finstock joining Adlestrop etc) then you would have no stations on a single line. You would also enhance the market Evesham to the West and Moreton to the East (the latter proving itself already).
The project was never remitted to provide an hourly service, although the new infrastructure will now allow that to be operated to the same level of reliability. Whoever said anything about there being a CBY-DID» shuttle ^ that was never a proposal.
My point is the market Moreton / Charlbury - East (to Oxford / Reading / Paddington) is still ripe for growth. The market west from Evesham West to Worcester / Kidderminster / Birmingham / is one that could easily be developed. Both opportunities weren't even options despite spending over ^60 Million.
Norton Junction cannot be improved until the Worcester area is resignalled, and the same applies for Wolvercot Junction.
I'm not suggesting they are re-modelled or improved, purely that the double line runs close to them. This should not affect either Worcester or Oxford.
As it stands the section of line that should be least used (Honeybourne - Moreton) is a major section that was re-doubled.
Thanks for your comments, Andy W - the point you make about time lost on a station stop is an interesting one, probably nearer to 2.5-3 minutes per station stop on linespeeds of 75-90mph rather than 4 minutes, but it is very relevant to the time a train takes to get through a section as you say.
Hi II,
Thanks for your reply. If you take your worst case 2.5 minutes @ 75 mph linespeed it still equates to over 3 miles per station or 3 minutes @ 90mph is 4.5 miles. Not inconsiderable.
Regarding Coombe & Finstock they are so close to Charlbury / Hanborough that I would like them to go the way of Stoulton / Wyre Piddle / Fladbury / Littleton & Badsey / Chipping Camden / Adlestrop et al.
You could also stop some of the practices that cause delays - I'm thinking, particularly, of banning bikes.
I'm sure, off the record,
FGW▸ would be delighted to be able to take such measures, but I can just imagine the negative publicity it would cause. I don't think it's going to happen, so you have to consider that when you come to making a decision, and that adversely affects your proposals as it will add a lot to the cost. GWR2006's points regarding the restrictions on signalling at both ends also have to be considered. His comments on the franchise renewal and upcoming electrification also echo my thoughts as to why we've not seen many improvements yet (with the Olympics thrown in for good measure).
The minority (bike riders) cause the majority (the rest of us) frequent delays. I would risk antagonising them and even try to make a virtue of it - I think the publicity may actually favour FGW.
As I have pointed out I am not suggesting any changes to either junction, merely that the double line section runs close to the junction, it would then be a single line, as is, over the jucntion to join the exisitng double lines into Worcester / Oxford.
80% availability is frankly pitifull. Would you buy a car that would be off the road a day and a half a week?
It's not the best, but then again you don't rag your car for up to 18 hours a day, every day, at speeds of up to 125mph! My point on reliability is that with only 5 units in the fleet, you either ask for 60% reliability and have three daily diagrams (achievable but pitiful), 80% reliability with four daily diagrams (achievable and realistic*), or 100% reliability (obviously not achievable).
I appreciate that with a fleet of 5 it is only practical to expect 4 to be available at any one time (80%) however I would expect 4 to be available 100% of the operational hours ie all routine maintenance / minor problem fixing to be performed outside operational hours. There will always be occaisions when turbostution is required but this should be exceptional.
As a side note, Train Managers at Paddington have started to learn (or re-learn in most cases) the route from Oxford to Great Malvern in readiness for their re-introduction. Driver (re)training has yet to commence as we haven't got the units back, but can't be too far off.
Good news. Please don't tell us they will have 'refurbished' high density seating a la
HSTs▸