Basingstoke-Reading upgrade possibilities

[brad465]

While this route being electrified has been the main suggestion in plenty of discussions (including the ill-fated electric spine project), have there been any proposals to upgrade the line in other ways?

Given this is a core freight and passenger route, combined with being mostly 3-aspect signalling and 75mph max, I certainly think other things could be explored, including:

- A 4-track section somewhere along the route, such as between the M4 and Bramley, encompassing a rebuilt Mortimer station.
- 4-aspect signalling
- 90/100mph max speed, enabled with extra 4-tracking
- A new station at Chineham
- In proper pipe dream territory, a dive-under/flyover for down trains at Basingstoke, passing under/over Gresley Road and surfacing on land currently occupied by down carriage sidings. (A dive-under would avoid the perpendicular Norn Hill road but burrowing under the SWML will be very disruptive).

 

[The Planner]

While this route being electrified has been the main suggestion in plenty of discussions (including the ill-fated electric spine project), have there been any proposals to upgrade the line in other ways?

Given this is a core freight and passenger route, combined with being mostly 3-aspect signalling and 75mph max, I certainly think other things could be explored, including:

- A 4-track section somewhere along the route, such as between the M4 and Bramley, encompassing a rebuilt Mortimer station.
- 4-aspect signalling
- 90/100mph max speed, enabled with extra 4-tracking
- A new station at Chineham
- In proper pipe dream territory, a dive-under/flyover for down trains at Basingstoke, passing under/over Gresley Road and surfacing on land currently occupied by down carriage sidings. (A dive-under would avoid the perpendicular Norn Hill road but burrowing under the SWML will be very disruptive).

4 aspect signalling doesn't get you more capacity unless the overall signal spacing is reduced, its not the panacea people think. It needs resignalling to get the headways down, but it doesn't necessarily need to be 4 aspect.
Ideally you would try and speed Oxford Road and Southcote Junctions up. Its also only 10 miles, so getting it up to 90mph is only 1½ minutes, probably only touching 1 minute if you factor in acceleration from Basingstoke and the aforementioned Southcote Jn if they are left alone.

 

[brad465]

4 aspect signalling doesn't get you more capacity unless the overall signal spacing is reduced, its not the panacea people think. It needs resignalling to get the headways down, but it doesn't necessarily need to be 4 aspect.

Yes this is what I meant, combining 4-aspect with reduced headways. I might be misremembering, but I recall the section of the National Railway Museum on signalling stating that 4-aspect is primarily used on busy mixed-traffic lines, which would definitely apply to Reading-Basingstoke.

 

[TheGrew]

How much of a constraint does the flat junction at the Basingstoke end impose? I can see the logic for a passing loop at Mortimer, and resignaling would certainly have some advantages, but I suspect the main challenge is the mixed-traffic nature, especially with the freight to/from Southampton Docks.

 

[The Planner]

How much of a constraint does the flat junction at the Basingstoke end impose? I can see the logic for a passing loop at Mortimer, and resignaling would certainly have some advantages, but I suspect the main challenge is the mixed-traffic nature, especially with the freight to/from Southampton Docks.

Its probably the stopper as it chews through occupancy, it takes 21 minutes of the hour.

 

[TheGrew]

Its probably the stopper as it chews through occupancy, it takes 21 minutes of the hour.

Fair enough, I guess that makes the case of an overtaking loop at Mortimer more valid especially if it doesn't need to be long enough to accommodate a freight train.

 

[JonathanH]

Fair enough, I guess that makes the case of an overtaking loop at Mortimer more valid especially if it doesn't need to be long enough to accommodate a freight train.

Would this be a long dynamic loop, or would the stopper have to wait time for the overtaking service to follow at headway, then progress far enough for the stopper to follow. Presumably fast turnouts needed as well?

Does land already exist in the railway's ownership?

Mortimer station is grade 2* listed which also suggests some issues with trying to change it.

 

[The Ham]

Its probably the stopper as it chews through occupancy, it takes 21 minutes of the hour.

It's why IF there was a way to send it to a reopened station at Oakley(might just be able to be run without new coaches needed) or even (with more stock) to Andover it may solve some of the capacity issues for freight and XC at Basingstoke (at a much lower cost than adding 2 lines north of the station).

As I understand it, the bigger issue is Southcote Junction (Newbury, Bedwyn, Exeter and Plymouth/Cornwall services as well as other freight on top of that going to/from the Basingstoke direction) and then between there and Reading West.

 

[brad465]

It's why IF there was a way to send it to a reopened station at Oakley(might just be able to be run without new coaches needed) or even (with more stock) to Andover it may solve some of the capacity issues for freight and XC at Basingstoke (at a much lower cost than adding 2 lines north of the station).

As I understand it, the bigger issue is Southcote Junction (Newbury, Bedwyn, Exeter and Plymouth/Cornwall services as well as other freight on top of that going to/from the Basingstoke direction) and then between there and Reading West.

Is there any part of that section that could increase capacity through extra tracks, assuming Reading West station complicates 3-4 track throughout? I was thinking if a short section of 4-track existed from Southcote Jct to almost Reading West, freight trains heading south could get out of the way of a Newbury-bound service quicker, while a northbound freight could be routed closer to Reading West ahead of a stopper and be less likely to have to stop, clearing the area quicker ahead of any fast service.

A more simpler option though that would deliver results is if all stopper services were BEMU, and all freight trains passing through there during the daytime hours were 99s or equivalent and able to accelerate off OHLE (which would mean extending wires towards Reading Green Park).

 

[swt_passenger]

How much of a constraint does the flat junction at the Basingstoke end impose? I can see the logic for a passing loop at Mortimer, and resignaling would certainly have some advantages, but I suspect the main challenge is the mixed-traffic nature, especially with the freight to/from Southampton Docks.

Enough for it to be covered in some detail in a route study document not that long ago. Wessex Route study of 2015, basically a ‘freight capacity’ driven scheme to provide an additional hourly freight path in each direction. Flyover just east of the station, and additional loops west of the station.

 

[Magdalia]

I was thinking if a short section of 4-track existed from Southcote Jct to almost Reading West

Most of Southcote Junction-Reading West is in a deep cutting in a built up area. The line is passing through a headland between the Thames and Kennet valleys.

HST Reading West 22-09-14 02

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Widening to 4 tracks would be very disruptive and expensive.

 

[cle]

This to be is a no brainer - XC should not be going along at 75mph for such a sustained, uncpmplicated route. It needs signal upgrades, line speed and then ideally junction works. Ideally another passenger tph could run along here (3tph shuttles? A Wessex SWT hourly to Reading? Something else from like a 80x from London GWML direction?) - as well as more freight.

Passing places would be helpful too but as mentioned, widening throughout would be hard. Opportunities exist either side of Green Park at least.

 

[Snow1964]

Would this be a long dynamic loop, or would the stopper have to wait time for the overtaking service to follow at headway, then progress far enough for the stopper to follow. Presumably fast turnouts needed as well?

Does land already exist in the railway's ownership?

Mortimer station is grade 2* listed which also suggests some issues with trying to change it.

It would be possible to have a third track, with a reversible loop as centre track. The trackbed was originally broad gauge, so there is extra width, but not 3 track width

Mortimer station could probably have a third track (converting the southbound platform to an island), as it is only fields that side, but a new span on the road bridge would be needed

 

[Hairyspotter]

They'd be better off fixing the appaling state of the track and infrastructure first....the rest is pie in the sky

 

[brad465]

They'd be better off fixing the appaling state of the track and infrastructure first....the rest is pie in the sky

Wouldn't it make sense to do any upgrades when infrastructure renewal is due, then they don't have to be done twice?

 

[The Planner]

Wouldn't it make sense to do any upgrades when infrastructure renewal is due, then they don't have to be done twice?

Renewals and enhancements are very different things. If its due track renewal etc in the short to mid term, its not going to wait.

== Doublepost prevention - post automatically merged: Yesterday at 20:47 ==

This to be is a no brainer - XC should not be going along at 75mph for such a sustained, uncpmplicated route. It needs signal upgrades, line speed and then ideally junction works. Ideally another passenger tph could run along here (3tph shuttles? A Wessex SWT hourly to Reading? Something else from like a 80x from London GWML direction?) - as well as more freight.

Passing places would be helpful too but as mentioned, widening throughout would be hard. Opportunities exist either side of Green Park at least.

Its 10 miles and you would save 60-90 seconds at best without doing Southcote.

 

[cle]

I thought it was a bit longer, like 15 or so...it's still a long time at slow speed. I didn't say or think it was a massive journey time hack by any means, but it should be way better.

 

[The Ham]

Most of Southcote Junction-Reading West is in a deep cutting in a built up area. The line is passing through a headland between the Thames and Kennet valleys.

HST Reading West 22-09-14 02

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Widening to 4 tracks would be very disruptive and expensive.

I do wonder if places like this (likewise around Winchester) where effectively 80% of the cut for a cut and cover tunnel has been undertaken already could be way to increase the number of tracks.

You'd ideally want at least a 1+2 pair of tunnels so that one bore could be worked on without totally closing rail use.

Whist we won't mention that supermarket project failure, it does highlight that there's the potential for above tunnel land use.

Although ideally a new liner park with good active travel facilities could create a cental core which other facilities could then be extended from.

 

[Magdalia]

I do wonder if places like this (likewise around Winchester) where effectively 80% of the cut for a cut and cover tunnel has been undertaken already could be way to increase the number of tracks.

You'd ideally want at least a 1+2 pair of tunnels so that one bore could be worked on without totally closing rail use.

Whist we won't mention that supermarket project failure, it does highlight that there's the potential for above tunnel land use.

Although ideally a new liner park with good active travel facilities could create a cental core which other facilities could then be extended from.

But where would the trains go during the long period of construction?

I remember the construction of the Hatfield tunnel on the A1(M), from many journeys through the roadworks. It was a nightmare, and it is much easier to provide a temporary road route through a construction site than it is for a railway.

 

[TheGrew]

It's a shame really that the Didcot, Newbury and Southampton got closed and much of the track bed was built over, as that would be a very useful bypass for freight.

 

[Helvellyn]

There was suggestion at one point to basically run two lines through the back of the station and use the four track section between there and Worting Junction to get trains across to the Down Lines, possibly adding a fifth line for some distance on the Up side (partly taken up by an EMU siding now)

As well as the Freight and CrossCountry services you also have two Waterloo stopping services crossing the Fast Libes each hour.

There's space at Micheldever (where it used to be four platforms/four tracks) for a turnback siding/platform to be built on the Up side of the Island if the former Up Slow was rebuilt as the through Fast line. Stopper would then run through Basingstoke platform 1, use the turnback platform at Micheldever, and on return to Basingstoke run through platform 4.

I mention that because less disruptive than building a flyover/dive under could be to just reduce the number of crossing moves in the station area through more dynamic use of the section between Basingstoke and Worting Junction if Reading Line traffic was routed through the back part of the station.

 

[The Planner]

It's a shame really that the Didcot, Newbury and Southampton got closed and much of the track bed was built over, as that would be a very useful bypass for freight.

As well as going across the entire job at Didcot and the very steep gradients, it was far from a problem solver.