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Author Topic: Digital Sensors "Will Reduce Gap Between Trains"  (Read 2025 times)
Lee
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Digital Sensors "Will Reduce Gap Between Trains"
« on: October 18, 2006, 10:25:20 AM »

Network Rail is planning to test the system in North Wales before installing it on high-speed lines (link below.)
http://www.rmtbristol.org.uk/2006/10/digital_sensors_will_reduce_ga.html#more

Network Rail will sign a £59 million contract next month to equip the Cambrian line , from Shrewsbury to Aberystwyth and Pwllheli. The line was chosen because it is a self-contained part of the network used by only a small of number of trains. The 12 trackside signals will be removed and the system will control the trains from December 2008.

Simon Kirby , Network Rail’s director of major projects , said a review of ERTMS in December would decide how to introduce it elsewhere. “Clearly we will go for a more complex line (than Cambrian) where there is more need to improve capacity for freight and passengers.”

I could think of several such routes myself. Lets hope that the extra costs involved dont stop it from being installed on secondary lines , many of which are projected to acheive medium or high - level tonnage growth to 2015.
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Graham Ellis
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Re: Digital Sensors "Will Reduce Gap Between Trains"
« Reply #1 on: October 18, 2006, 02:56:03 PM »

It sounds like it could be quite superb way of getting "flights" of trains through between Chippenham and Trowbridge - rather that a 20 minute headway making for a current capacity of 3 trains an hour, a five minute headway with trains running 3 one way then 3 the other would allow 6 trains an hour - and all those are figures that allow time to the trains to stop at Melksham too.
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Lee
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Re: Digital Sensors "Will Reduce Gap Between Trains"
« Reply #2 on: October 18, 2006, 03:53:56 PM »

I agree , Graham. Any increase in line capacity through Melksham would be welcome. However , I suspect that the current realistic capacity is lower than 3 trains an hour , in order to avoid delays over this route.

It is also worth bearing in mind that , in another pointless PWQ answer , Derek Twigg confirmed that joint action plans are in place between Network Rail and First Great Western to address performance issues , including the Swindon to Westbury route. These are monitored monthly.

Chris Grayling: To ask the Secretary of State for Transport what steps the Government have taken to improve rail services between Swindon and Westbury and at intermediate towns to provide transport alternatives for the new housing planned in the area.

Derek Twigg: Improving rail performance is a key objective for the Department for Transport. Joint action plans are in place between Network Rail and First Great Western to address performance issues, including the Swindon to Westbury route. These are monitored monthly.

Demand for rail services between Westbury and Swindon is concentrated at peak periods, and the Government have specified direct train services at these times.

In other words, a moderate increase in traffic could be caused by a removal of the majority of passenger trains and a massive increase in freight, and that is what you're foreseeing?

Here are some more quotes , the first two from the Network Rail Business Plan 2006.

On future capacity requirements :

"changes to the timetable structure to reduce the mix of different train types and the number of conflicting moves."

"Between Didcot and Oxford the mix of non stop passenger and freight services with local services calling at little used stations reduces the ability to maximise capacity."

I quote from FGW's web site ...

[i]Over the term of the franchise we will invest £200 million in a programme of continuous improvement bringing a wide range of customer benefits, increased capacity, safety and service. We will also work with Network Rail to tackle deep-rooted performance issues on the Greater Western network.

Our immediate priorities are to ensure a smooth integration of the three franchises; introduce a new Timetable in December 2006; and deliver service improvements for our customers as early as possible.

In other words , Network Rail would like to work with TOC's to remove local or stopping services , in order to free up capacity and improve performance. First agree with this , mainly because they have been directed to by the DfT.

Before we let First off the hook , it should be remembered that both their bus and railfreight sectors benefit from this.

It should also be remembered that both First & Network Rail can propose a closure under the new DfT Closure Guidance.

As far as the medium - long term future is concerned , I feel that this quote from the Network Rail Business Plan 2006 is appropriate :

"The RSS (Regional Spatial Strategy) also recommends that commercial developments which generate high volumes of freight movements should be located close to appropriate rail freight facilities to support more sustainable distribution in the South West."

Have a look at the link below.
http://www.savethetrain.org.uk/forum/index.php?topic=311.msg859#msg859

And section 8.5 of this one.
http://www.transport2000.org.uk/library/RoadstoRuin/section_08.htm

Quote from the above link :

"More serious attention needs to be given to freight movements through the county. In particular, there is potential for mini-rail-freight terminals in Wiltshire along the A350/A36 corridor. A rail-freight terminal at Westbury is planned, but this is some distance from proposed route of bypass. The parallel rail line (Westbury-Melksham-Chippenham-Swindon) has only one train per day in each direction but the service is due to be improved."

Since the above was written , the number of freight trains has increased on the Melksham line.

All in all , it would be fair to say that I am not optimistic , Graham.
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Graham Ellis
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Re: Digital Sensors "Will Reduce Gap Between Trains"
« Reply #3 on: October 18, 2006, 05:12:39 PM »

I agree , Graham. Any increase in line capacity through Melksham would be welcome. However , I suspect that the current realistic capacity is lower than 3 trains an hour , in order to avoid delays over this route.

Agreed. The calculations I did were both theoretic maxima.  Bearing in mind the buy main lines at both ends, I would suggest that the capacity figure in real life would be around a half of what I quoted, both in current and digital-sensor mode - up from 1.5 trains to 3 trains. That would allow a 2-hourly passenger service AND a freight train each way each hour.

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Derek Twigg:....Demand for rail services between Westbury and Swindon is concentrated at peak periods, and the Government have specified direct train services at these times.

Talk about playing with words - in the morning the Government HAS specified a peak service, but that's not actually being provided - there's a pre-peak service only.  In the evening, the definition of "peak" as up to 7 p.m. is questionable for this route; the operator is allowed to run a train up to one hour later than the DfT's consultant recommends.

Oh - and whilst there is a degree of concentration at peak periods (isn't that the very definition of a peak - the time with highest traffic?) it's not a great concentration.   Witness 42 people on the 05:52 out of Melksham, or about 50 on a recent Saturday train that's being withdrawn. Witness 13 people on and off the train at Melksham last night at 17:02, and we all know that for every 1 who gets on and off, three more make through journeys.  I make that a loading of around 40 people.
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Lee
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Re: Digital Sensors "Will Reduce Gap Between Trains"
« Reply #4 on: October 18, 2006, 05:37:23 PM »

Agreed. The calculations I did were both theoretic maxima.  Bearing in mind the buy main lines at both ends, I would suggest that the capacity figure in real life would be around a half of what I quoted, both in current and digital-sensor mode - up from 1.5 trains to 3 trains. That would allow a 2-hourly passenger service AND a freight train each way each hour.

As long as they dont reserve it for main lines only , which , Im afraid , rather looks the intention.

The other challenge is to retain the Melksham passenger service in the meantime. Network Rail appear to regard the mix of different train types as just as big a problem as the number of trains using a particular line.
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Lee
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Re: Digital Sensors "Will Reduce Gap Between Trains"
« Reply #5 on: November 02, 2006, 06:37:04 PM »

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