The Anonymous Widower

Every Picture Tells A Story!

The April 2017 Edition of Modern Railways has a picture of a  Crossrail Class 345 train on the High Meads Loop.

The main purpose of the High Meads Loop would appear to be to allow trains to go from Lea Bridge station through Platform 11 or 12 at Stratford station and then back to Lea Bridge without the driver changing cabs.

So what was the train doing?

  • I doubt it would have been running up the busy West Anglia Main Line, as even in the maddest scenarios, Crossrail will not be running there.
  • Could it have just been route proving on a line that other Aventras will use from 2018 or 2019?
  • Perhaps it was running to Broxbourne to assess performance for Crossrail 2.

But if it is was running on the High Meads Loop, as the picture caption says, was it testing that Aventras can be turned using the loop?

So could this mean that services from the  West Anglia Main Line terminating at Stratford will use the High Meads Loop rather than the Platforms 11 and 12.

Each of Platforms 11 and 12 could probably handle four trains per hour (tph), as is regularly handled by terminal platform on the London Overground.

But terminating in the High Meads loop, which would mean that all services would call at perhaps Platform 11 could give a capacity of upwards of 14 tph, as is the frequency on the Wirral Line on Merseyrail. But the Wirral Line was designed in the 1970s , so surely we can do better than that, as Crossrail and Thameslink will handle 24 tph and even the conventionally signalled East London Line will be handling 20 tph in 2019.

If it was 20 tph, this would mean that Platform 11 at Stratford could see a train every three minutes, possibly going to the following.

  • 4 tph to Walthamstow Central and Chingford via the Hall Farm Curve.
  • 8 tph to Broxborne
  • 2 tph to Hertford East
  • 2 tph to Bishops Stortford
  • 2 tph to Stansted Airport
  • 2 tph to Cambridge

In addition the following services could run from Liverpool Street.

  • 2 tph to Hertford East
  • 2 tph to Bishops Stortford
  • 2 tph to Stansted Airport
  • 2 tph to Cambridge

This sort of schedule would be possible given the following improvements and developments.

Signalling

Modern signalling as fitted to Crossrail and Thameslink is installed.

Stadler Flirts

Stadler probably have a good knowledge of the performance of the Flirts.

Current fastest timings are as follows.

  • Liverpool Street to Broxbourne – 25 minutes
  • Broxbourne to Cambridge – 45 minutes.

The Flirts will be faster than the current trains and will be optimised for a very fast stop at a station. So I do wonder what sort of times could be achieved between Bishops Stortford and Cambridge stopping at all stations.

Fast Lines To Broxbourne

Two separate non-stop fast lines will be built between Tottenham Hale and Broxbourne.

  • Cambridge and Stansted services take the fast line to Broxbourne.
  • All trains on the fast lines will be Stadler Flirts.
  • With fast line trains the first stop is Broxbourne.

The fast lines would also handle extra services from Liverpool Street, which might be 2 tph to each of Stansted Airport and Cambridge.

A summary of traffic on the fast lines between Tottenham Hale and Broxbourne could be.

  • 2 tph – Liverpool Street and Cambridge
  • 2 tph – Stratford and Cambridge
  • 2 tph – Liverpool Street and Stansted Airport
  • 2 tph – Stratford and Stansted Airport

There is probably a few paths for other trains.

North Of Broxbourne

North of Broxbourne the service will be very much better than now.

  • What helps is that both the Flirts and the Aventras will be masters of the quick stop-start at a station.
  • Stansted services will probably go non-stop from Broxbourne..
  • Some Cambridge services will go non-stop and others will stop at all stations.

I think it can be arranged that all stations North of Broxbourne get 4 tph in both directions.

A summary of traffic on the lines between Broxbourne and Bishops Stortford could be.

  • 2 tph – Liverpool Street and Bishops Stortford
  • 2 tph – Stratford and Bishops Stortford
  • 2 tph – Liverpool Street and Cambridge
  • 2 tph – Stratford and Cambridge
  • 2 tph – Liverpool Street and Stansted Airport
  • 2 tph – Stratford and Stansted Airport

A summary of traffic on the lines between Bishops Stortford and Cambridge could be.

  • 2 tph – Liverpool Street and Cambridge
  • 2 tph – Stratford and Cambridge
  • 2 tph – Liverpool Street and Stansted Airport
  • 2 tph – Stratford and Stansted Airport

There would also be additional Stansted Airport to Cambridge services.

Slow Lines

The slow lines will be upgraded to be able to handle 16 tph stopping at all stations between Tottenham Hale and Broxbourne, which they probably do now at times.

  • All trains on the slow lines are Aventras.
  • A second platform is built at Ware, as this would enable four tph to Hertford East.
  • Cross-platform interchange between slow and fast lines at Broxbourne.

A summary of traffic on the slow lines between Tottenham Hale and Broxbourne could be.

  • 8 tph – Stratford to Broxborne
  • 2 tph – Straford to Hertford East
  • 2 tph – Stratford to Bishops Stortford
  • 2 tph – Liverpool Street to Hertford East
  • 2 tph – Liverpool Street to Bishops Stortford

Crossrail 2 is proposing a frequency of 12 tph North of Tottenham Hale, so my randomly-chosen frequency gives you that.

Liverpool Street

Liverpool Street station will become the terminus for the following.

  •  Great Eastern Main Line.
  • 2 tph to each of Bishops Stortford,, Cambridge, Hertford East and Stansted Airport.
  • London Overground setvices to Cheshunt, Chingford and Enfield Town.
  • Perhaps a few c2c services.

Given that Liverpool Street and Stratford are just eight minutes away on Crossrail, is there any reason to keep West Anglia Main Line services at Liverpool Street?

But then, there are others who know more about train scheduling than me and perhaps a good balance can be made between the two termini.

Stratford International Station

If Stratford services used the High Meads Loop, a connection could be built to Stratford International Station.

Crossrail 2

Crossrail 2-like frequencies would have been created between Tottenham Hale and Broxbourne.

All it would need to complete Crossrail 2 after the suburban services out of Waterloo have been upgraded this summer, is to build the Central Tunnel.

Conclusion

Using the High Meads Loop is a good plan.

 

 

 

 

 

 

, Does that mean that Stansted and Cambridge services will be using Stratford as a terminal when Greater Anglia gets Aventras and Flirts?

 

Were they just seeing if it fits?

March 23, 2017 - Posted by | Travel | , , ,

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