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How long will the Class 158 & 159 soldier on for?

amahy

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156s are already a common sight on those routes, replacing those 156s with 158s probably wouldn't have a big impact.
Yes, but the mainstay is still 150s. Also, Leeds to Wigan does sometimes suffer from dwell time issues, as it is a stopping service operated with 158s, especially if the train guard/driver is on the slow side, so I doubt running 158s over 150s would be beneficial.
 
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stevieinselby

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Yes, but the mainstay is still 150s. Also, Leeds to Wigan does sometimes suffer from dwell time issues, as it is a stopping service operated with 158s, especially if the train guard/driver is on the slow side, so I doubt running 158s over 150s would be beneficial.
At what point does the better performance of the 158s offset the slower loading compared to a 150?
 

AlastairFraser

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At what point does the better performance of the 158s offset the slower loading compared to a 150?
Linespeeds aren't high enough/stops aren't far apart enough to offset the slower loading on many lines.
For example Blackburn to Wigan/Headbolt Lane - there's a huge section of quite low linespeeds from Burnley to Todmorden, and then you have the section from Manchester to Wigan, where quite a few stations are only a mile or less apart.
It's probably better for Northern to wait for the Sprinter replacement order and for TfW to give GWR their 158s to get rid of 150s down there, and if a few Northern 150s have to be withdrawn early, backfill them with ex GWR units.
 

absolutelymilk

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DfT procurement pipeline spreadsheet has recently been updated (on 19th February) and appears GWR fleet expected to be replaced 2029-2031 and Northerns at slightly slower pace to 2032

However DfT indicative target dates often seem to be more a ballpark timeframe flexible by few years than definite plan.

Nothing appears for East Midlands or SWR so presumably both are expected to get hand me downs from other lines as their replacements

Interesting - is there a thread for the GWR fleet replacement?
 

Snow1964

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Northern's 158s will be replaced as part of the ongoing tender for replacement,
TfW's are getting being replaced by 197s soon,
GWR's don't really have an end in sight any time soon, same with EMR's or ScotRail's.
Just re-read the latest (19th February) version of DfT procurement spreadsheet.

Northern has 3 lots :
lot 1) 12 x 3 vehicle EMUs 2029-2030
lot 2) 48 x 3 vehicle & 64 x 4 vehicle MMUs 2030-31
lot 3) 8 x 4 vehicle BEMU in 2032

GWR is estimated at 480 vehicles (unspecified formation) mix of dc BEMU, ac BEMU, ac EMU and bimodes 2029-32

Yes they have, they're surely part of Lot 2 Phase 2 (many bi-modes).
lot 2 has 400 vehicles, I think Northern has slightly more than 400 15x (including 158s), but not including 170 and 195 diesels. Although with Transpennine route electrification some diesels might be replaced by existing spare EMUs

 

pokemonsuper9

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lot 2 has 400 vehicles, I think Northern has slightly more than 400 15x (including 158s), but not including 170 and 195 diesels. Although with Transpennine route electrification some diesels might be replaced by existing spare EMUs
Northern have (by my maths) 201 15x units, with 412 carriages total.
Which is just below Lot 2 - Phase 1's ~400 carriages (if you add Lot 1 and 3, that goes to 127 units (453 vehicles) in Phase 1)

Northern specifically said the first part of their procurement is for replacing 150s, 155s and 156s, but Phase 1 far surpasses the sum of carriages (298 vehicles across 148 units), so there must be something else accounted for under that, and the 158s about reach that.

Lot 1 Phase 1 is for taking over services from TPE once TRU is done,
Lot 1 Phase 2 is like-for-like replacement of 323s and 333s (the numbers line up perfectly)
 

FrontSideBus

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I remember, a couple of decades ago when I was a lad, at being absolutely fascinated by the onboard pay phones that 158's used to carry back then!!! It was out of this world!
I hope 158's soldier on for quite a while because they really are better than any of the modern replacements like 195's ect.
 

Trainman40083

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Northern have (by my maths) 201 15x units, with 412 carriages total.
Which is just below Lot 2 - Phase 1's ~400 carriages (if you add Lot 1 and 3, that goes to 127 units (453 vehicles) in Phase 1)

Northern specifically said the first part of their procurement is for replacing 150s, 155s and 156s, but Phase 1 far surpasses the sum of carriages (298 vehicles across 148 units), so there must be something else accounted for under that, and the 158s about reach that.

Lot 1 Phase 1 is for taking over services from TPE once TRU is done,
Lot 1 Phase 2 is like-for-like replacement of 323s and 333s (the numbers line up perfectly)
I presume something will replace the 769s at some point.
 

Snow1964

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DfT has updated its procurement spreadsheet 27th May 2025

The GWR line, now includes words :
Potential for this procurement to include units for other non-GWR routes


My reading of change, is that door has been opened for additional units of same type to be obtained to operate in other parts of the country. GWR procurement are BEMUs and/or diesel multi-mode units replacing all existing DMUs (and possibly EMUs). I don't know if existing DMUs includes 175s
 

Xavi

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The proportion of passengers who do the full journey London to Exeter is small, evidenced by the fact that one unit is detached at Salisbury from many of the trains arriving from Waterloo.
From the (GBR) May timetable all services west of Salisbury except the first up and several late evening services are 6-car. This is long overdue as overcrowding was very common on daytime 3-car services. Whilst Paddington is understandably more popular from Exeter, there are many passengers travelling to Waterloo from East Devon and Dorset stations. Local traffic to / from Exeter Central also requires 6-car units on many services.
 

Kite159

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My reading of change, is that door has been opened for additional units of same type to be obtained to operate in other parts of the country. GWR procurement are BEMUs and/or diesel multi-mode units replacing all existing DMUs (and possibly EMUs). I don't know if existing DMUs includes 175s
Logically, it would make sense to have a larger order of the same sort of trains for multiple operators, as it could drive the build cost down.

Similar to BR with the sprinters.
 

pokemonsuper9

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Logically, it would make sense to have a larger order of the same sort of trains for multiple operators, as it could drive the build cost down.
Indeed, I remember this being discussed a bit when Northern's order was first made (but that now is clearly all just for Northern).

Adding in some units to replace (For example) SWR's 158s/159s at the same time would make sense.
 

Snow1964

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A recent Modern Railways article suggests that GWR do not think the aluminium bodied DMUs (classes 158, 165, 166) will be able to survive beyond 2032 due to corrosion and possibly parts. I guess this also applies to 159s.

Sounds like GWR and DfT not in same place with replacement timeline. With GWR wanting BEMUs ordered sooner (and some bits of electrification around Yate, Bristol Temple Meads and Westbury, and towards Oxford), whilst DfT is in more of a not for a few more years mindset.

Also suggests GWR need longer or more frequent IETs in some areas, so need to free up those stuck covering on regional routes.

Meanwhile DfT did update their procurement spreadsheet 11th September and GWR entry now suggests could be additional trains of same type order for other operators

Procurement of rolling stock for Thames Valley / North Downs and West (including options)Replacement of all existing DMUs (and possibly EMUs), excluding the IET fleet, with Battery Electric Multiple Units (BEMUs) and/or diesel multi-mode units. Potential for this procurement to include units for other non-GWR routes.

 

JonathanH

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Sounds like GWR and DfT not in same place with replacement timeline. With GWR wanting BEMUs ordered sooner (and some bits of electrification around Yate, Bristol Temple Meads and Westbury, and towards Oxford), whilst DfT is in more of a not for a few more years mindset.
Is it GWR's problem given the movement to GBR in the not too distant future? Presumably any decision is going to depend on the Treasury funding being released, and that needs to wait for the November budget? Or am I wrong?
 

tfw756rider

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A recent Modern Railways article suggests that GWR do not think the aluminium bodied DMUs (classes 158, 165, 166) will be able to survive beyond 2032 due to corrosion and possibly parts. I guess this also applies to 159s.
While I see the "parts" (and very much support new trains), aren't the aluminium bodyshells of the 158s/159s/165s/166s supposed to not corrode like the steel ones of the 150s/175s do?

I seem to recall that in fact, "aluminium bodyshells that are therefore corrosion-free and have loads of life left in them" (words to that effect) was specifically stated by Alice from Vivarail in the Fully Charged D-Train video.
 

JLH4AC

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While I see the "parts" (and very much support new trains), aren't the aluminium bodyshells of the 158s/159s/165s/166s supposed to not corrode like the steel ones of the 150s/175s do?

I seem to recall that in fact, "aluminium bodyshells that are therefore corrosion-free and have loads of life left in them" (words to that effect) was specifically stated by Alice from Vivarail in the Fully Charged D-Train video.
Aluminium is one of the more corrosion-resistant metals, but it will still corrode especially if exposed to salts and pollutants or subjected to stress or abrasion.
 

Snow1964

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While I see the "parts" (and very much support new trains), aren't the aluminium bodyshells of the 158s/159s/165s/166s supposed to not corrode like the steel ones of the 150s/175s do?

I seem to recall that in fact, "aluminium bodyshells that are therefore corrosion-free and have loads of life left in them" (words to that effect) was specifically stated by Alice from Vivarail in the Fully Charged D-Train video.
The aluminium will corrode (rather than rust), but unlike an all steel construction, it is not easy to replace a piece of aluminium panel.

Cannot just cut out a corroded piece and spot weld it to steel underframe one edge, and join it to the aluminium body panel with seemless join. They can be fixed, but if doing so makes sense economically on a train that is 35 years old is different question.
 

tfw756rider

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The aluminium will corrode (rather than rust), but unlike an all steel construction, it is not easy to replace a piece of aluminium panel.

Cannot just cut out a corroded piece and spot weld it to steel underframe one edge, and join it to the aluminium body panel with seemless join. They can be fixed, but if doing so makes sense economically on a train that is 35 years old is different question.
Ah right yeah, thanks.
 

Peter Mugridge

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Aluminium is one of the more corrosion-resistant metals, but it will still corrode especially if exposed to salts and pollutants or subjected to stress or abrasion.
In the case of salts, salt water is a particular factor in aluminium corrosion, so for the railway context we have the double whammy of the coastal routes - particularly Dawlish - and the salts used on platforms in icy conditions.
 

FrontSideBus

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With different metals in contact with each other, you also suffer from galvanic corrosion.
 

Mikey C

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In the case of salts, salt water is a particular factor in aluminium corrosion, so for the railway context we have the double whammy of the coastal routes - particularly Dawlish - and the salts used on platforms in icy conditions.
The generally "inland" SWR 159s may perhaps be in better condition than the GWR 158s then?
 

Peter Mugridge

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The generally "inland" SWR 159s may perhaps be in better condition than the GWR 158s then?
They're also the last built aren't they, so marginally younger - although while they will have mostly avoided the sea spray ( didn't they used to run to Paignton? ) there's still all the salts used on platforms in winter that they will have been exposed to aren't there?
 

Trainbike46

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They're also the last built aren't they, so marginally younger - although while they will have mostly avoided the sea spray ( didn't they used to run to Paignton? ) there's still all the salts used on platforms in winter that they will have been exposed to aren't there?
I would assume platform salt would be less significant than road salt, because the trains is exposed to less than a vehicle on the road would be.

From experience with my bicycle, when I moved from living inland to the coast in Edinburgh, sea air has a much bigger impact. When I lived inland, my bike had no corrosion issues at all, even though I used it when roads were salted. Within one year in Edinburgh my bike developed corrosion, and the only difference was the sea air. Things like Dawlish will have an even bigger impact.

So while I'm sure the platform salt does cause and worsen corrosion, it will be a lot less than experienced by a unit working on the coast year round.
 

bramling

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Class 158 and 159 have now been around for a considerable amount of time. From memory 158s were built between 1989 and 1992 and 159s were with between 1992 and 1993. I wonder how many more years before we see these units withdraw from service or will they solider on for many more years like 205 and 207 units did.

Thanks

I’ve wondered if we could reach a situation where the limiting factor on the 158/59 fleets is electronics, rather then the condition of the bodyshell. Arguably we’ve already been there since virtually day one with the air conditioning.

Whilst, ventilation aside, the 158 isn’t a bad train from the passenger point of view, there’s been posts on here from people who work them which are less favourable. In essence the 156 actually seems to be a better train providing someone is prepared to pay to keep patching up the bodywork, which is at least a fairly known quantity albeit always seems to be on a worse scale than anticipated.
 

61653 HTAFC

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They're also the last built aren't they, so marginally younger - although while they will have mostly avoided the sea spray ( didn't they used to run to Paignton? ) there's still all the salts used on platforms in winter that they will have been exposed to aren't there?
The 159/0s were the last-built. The /1s are a bit older as they were originally part of the Trans-Pennine 158 fleet- so whilst they won't have run beyond Exeter for SWT/SWR they did run to Scarborough and Hull (plus short-lived extensions to Bridlington). I think they saw occasional use to Blackpool too in Northern Spirit/Arriva Trains Northern days.
 

D365

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They're also the last built aren't they, so marginally younger - although while they will have mostly avoided the sea spray ( didn't they used to run to Paignton? ) there's still all the salts used on platforms in winter that they will have been exposed to aren't there?
As far as age is concerned - a single digit difference in years is neither here nor there when considering bodyshell condition.
 

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