The Anonymous Widower

KeolisAmey’s Plans For The Rhymney Line

This document on the KeolisAmey web site details their plans for the new Wales and Borders Franchise.

The Rhymney Line has the following characteristics.

  • It runs between Cardiff Queen Street and Rhymney stations.
  • Most of the line is double-track, with a short length of single-track from Tir-Phil station.
  • There is the Coryton branch line to Coryton station.
  • From Cardiff to Bargoed station, there are four trains per hour (tph)
  • North of Bargoed, an hourly service generally operates.
  • \from Cardiff to Coryton station, there are two tph.
  • Some services, run through Cardiff to Penarth or Barry Island stations.
  • Services take sixty-one minutes between Rhymney and Cardiff.
  • Services take eighteen minutes between Coryton and Cardiff.

What improvements will be made to the Rhymney Line?

New Trains

From 2019, cascaded Class 170 trains will run services on the line.

In 2023, these trains will replaced by new Tri-Mode Stadler Flirts.

Current plans, don’t envisage any of the Stadler Citylink Metro Vehicles working the line. But I don’t see any reason why they can’t, if say Transport for Wales wanted to run a service from Cardiff Bay to Coryton or any other station.

It could be that their batteries don’t have enough capacity for the Caerphilly Tunnel.

New Stations

The KeolisAmey document, states that a new station will be built at  Crwys Road.

I’ve also read somewhere that there may be a station on the Coryton Line to serve a major new hospital.

Improved Services

In 2023, the following services will be in place.

  • From Cardiff to Rhymney station, there will be four tph.
  • From Cardiff to Coryton station, there will be two tph.
  • Services will take forty-eight minutes between Rhymney and Cardiff.
  • Services will take twenty minutes between Coryton and Cardiff.

The Coryton service is slower because of the proposed new station.


The line will be electrified using 25 KVAC.

  • There is a short tunnel at Bargoed station.
  • There is a mile-long tunnel at Caerphilly.
  • There were quite a few footbridges across the tracks.
  • The margins on either side of the track seem adequate on much of the route.

It looks to me, that electrification of the Rhymney Line cshuld be possible, provided the design is good.

The Tri-Mode Stadler Flirts will have batteries, which will have these purposes.

  • Provide traction power for the trains, where there is no electrification.
  • Capture the energy generated by the traction motors under braking.
  • Ensure that power is always available for the train’s control, driver and passenger systems.

On the Rhymney Line, battery power will also be used to provide traction power in the mile-long Caerphilly Tunnel.

I have been told that although the tunnel will not be electrified, there will be an overhead rail for the pantograph in the tunnel, which will not be electrified.

This means that the pantograph doesn’t have to be raised and lowered, as the train goes up and down the hill, as there is a continuous overhead rail and line for the pantograph to use all the way.

I believe that when the train is coming down the hill, that gravity and the onboard battery will give sufficient power to bring the train safely down the hill.

So is there any point in electrifying the downhill path?

  • The two terminals on the line; Rhymney and Coryton stations, are single platform stations on single-track lines, which will surely be electrified.
  • If necessary batteries could be topped up before on the single track sections, before joining the double-rack line to Cardiff.
  • There is very little if any freight or engineering trains on the line. But these will be diesel-hauled.
  • After the modernisation, all the passenger trains will be the new electric trains with batteries and/or diesel engines.
  • Diesel trains and locomotives could continue to work the lines as required.

I don’t think there is any operational reason for the downhill path to be electrified.

It would reduce costs in both construction and maintenance.






June 9, 2018 - Posted by | Transport | , , , , , ,

1 Comment »

  1. […] Rhymney Line […]

    Pingback by The Greening Of The Valleys « The Anonymous Widower | June 9, 2018 | Reply

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