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Are there too many ‘preserved’ diesels and how could they be thinned out?

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Ashley Hill

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At some point the specialist knowledge required to keep heritage diesel locos running might get a bit scarce.
That could be argued for steam too but each generation has learnt from the previous. It might affect a loco owned by an individual but those owned by groups seem to have acquired that specialist knowledge to keep their locos running,hopefully for decades to come.
 
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At some point the specialist knowledge required to keep heritage diesel locos running might get a bit scarce.

Perhaps a controversial thought, but maybe some of these locos weren't built especially well to begin with? The 26s and 27s I've seen in preservation appear to be battling corrosion issues. The two 26s at Boat of Garten seem especially grim. Wasn't there an issue with cracked bogies on a 40 that limped around in early preservation?

This technology matured over time, whereas early diesel locos were built to steam-era tolerances
Given that they are now around 60 years old, doesn’t that suggest the opposite? Expecting something that age, that spends much of its time outside, to not have corrosion seems rather optimistic to say the least.
 

birchesgreen

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At some point the specialist knowledge required to keep heritage diesel locos running might get a bit scarce.
I suspect the specialist knowledge to keep steam locos running will get scarce sooner. I suspect both will be fine.
 

Alanko

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I suspect the specialist knowledge to keep steam locos running will get scarce sooner. I suspect both will be fine.

Steam is surely pretty basic though? We must have lost the majority of people who ever built or maintained steam locos in anger?

Early diesel stuff would appear to have the capacity to be Byzantine (such as the innards of a Deltic) or idiosyncratic.
 

birchesgreen

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Steam is surely pretty basic though? We must have lost the majority of people who ever built or maintained steam locos in anger?

Early diesel stuff would appear to have the capacity to be Byzantine (such as the innards of a Deltic) or idiosyncratic.
Early ICEs are pretty basic too and can be worked out and understood, where we might run into trouble in future is when locos/units with computerised systems start getting preserved.
 

reddragon

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Steam & Early diesels are easy to maintain as are old cars. Throw in too much tech, modern materials etc and you need to de-tech to keep it working.

That is why 60s, 70s, 80s signalling goes before semaphores!
 

Meerkat

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That poses an issue with 58s and 60s with anti wheel-slip technology written in ancient programming language?
Wouldn't you just isolate it if it went wonky - are 58s/60s really going to need it on a preserved railway?
 

Fragezeichnen

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That poses an issue with 58s and 60s with anti wheel-slip technology written in ancient programming language?

It will have to be replaced with something else.

The Class 89 already has parts of it's electronics replaced with redesigned circuits manufactured using modern components.

Ultimately all advanced electronics will end up like this. Perhaps a clever fabricator can machine a new engine block - but one-off microchips are simply not a thing.
 

61653 HTAFC

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In terms of the OP's query: if there are too many preserved diesels of a given type, as they age some will probably fall by the wayside and end up stripped for spares and then either scrapped or stuffed and mounted.

I don't see any advantage to artificially starting this process before it happens "naturally" for want of a better word.
 

XAM2175

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The Class 89 already has parts of it's electronics replaced with redesigned circuits manufactured using modern components.
My memory is very hazy and I might be completely wrong, but has this not also been the case with some bits on the 91s?
 

61653 HTAFC

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My memory is very hazy and I might be completely wrong, but has this not also been the case with some bits on the 91s?
I think a fair bit of electrical kit was updated at the mid-life overhaul (when they became 91/1) but that was while they were still in frontline service. For preservation costs are more prohibitive, and the owners need to weigh up whether they value authenticity over utility.
 

XAM2175

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For preservation costs are more prohibitive, and the owners need to weigh up whether they value authenticity over utility.
Oh, entirely. My question was leading more towards an observation that it had been necessary even before they entered preservation.
 

61653 HTAFC

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Oh, entirely. My question was leading more towards an observation that it had been necessary even before they entered preservation.
Isn't there a preserved 4-CEP unit that's in the process of being returned to as-built condition? It's certainly not unheard of for mid-life modifications required in service to be reversed in preservation. That said, I can't imagine that the owners of either of the 142s being repainted into GMPTE orange will also want to return to the original gremlin-infested drivetrain!
 

Strathclyder

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Isn't there a preserved 4-CEP unit that's in the process of being returned to as-built condition? It's certainly not unheard of for mid-life modifications required in service to be reversed in preservation. That said, I can't imagine that the owners of either of the 142s being repainted into GMPTE orange will also want to return to the original gremlin-infested drivetrain!
Indeed, at least in the Pacers' case, a balance of authenticity & reliablity is key. To me, returning a Pacer to as close to original condition as possible cosmetically while retaining the modified drivetrain seems like the best way to go about things; no doubt the above owners feel the same way.
 
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Spartacus

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Indeed, at least in the Pacers' case, a balance of authenticity & reliablity is key. To me, returning a Pacer to as close to original condition as possible cosmetically while retaining the modified drivetrain seems like the best way to go about things; no doubt the above owners feel the same way.

I wonder if we'll see a return of the original doors on any? Were these a pretty standard Leyland product?
 

Strathclyder

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I wonder if we'll see a return of the original doors on any? Were these a pretty standard Leyland product?
Interesting to ponder. I'd personally wager the extant two-leaf doors will be kept on grounds of cost/spares availability, but it is ultimately up to the owners whether or not to fit the original four-leaf doors.

As for originality, four-leaf doors were standard on the majority of Leyland's buses of the period, so it would of course be authentic in that respect, but again, it's entirely up to the owners.
 

DustyBin

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No there aren’t too many preserved diesels, but more importantly how on earth did this thread eventuate from a discussion about the BBC/ITV?! :lol:
 

Cowley

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No there aren’t too many preserved diesels, but more importantly how on earth did this thread eventuate from a discussion about the BBC/ITV?! :lol:
Oops! Changed it now. :)
 

Richard Scott

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Indeed, at least in the Pacers' case, a balance of authenticity & reliablity is key. To me, returning a Pacer to as close to original condition as possible cosmetically while retaining the modified drivetrain seems like the best way to go about things; no doubt the above owners feel the same way.
No, put the TL11 back in it too!!!
 

eldomtom2

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Early ICEs are pretty basic too and can be worked out and understood, where we might run into trouble in future is when locos/units with computerised systems start getting preserved.
How plausible is ripping out the old computer system and shoving in a new one that you do know the workings of?
 

Spamcan81

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This is where the lines get a bit blurry. To me the West Coast diesels are a main line operational fleet and as you say those locos are a source of spares.
I’d probably consider their steam locomotives to be ‘preserved’ though as I can’t see a situation where they’d be in danger of being scrapped.

There is one Battle of Britain Pacific at Carnforth that seems unlikely to be restored from Barry condition but does seem to have given up some components to aid the overhaul of sister locos.
 

birchesgreen

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How plausible is ripping out the old computer system and shoving in a new one that you do know the workings of?
Its quite plausible if there is adequate documentation. Probably be plenty of geeks around who would like to try as well.
 

Richard Scott

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How plausible is ripping out the old computer system and shoving in a new one that you do know the workings of?
There are a number of preserved locos that have modern electronic AVRs (Automatic Voltage Regulator) that they were never fitted with so certainly people out there who are more than capable of doing such things.
 

Meole

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The 1904 NER Autocar running at Embsay uses redundant parts from HST to enable it to operate authentically restored cosmetically but using more modern mechanical motive power, the LMS 10000 recreation is similar.
 

43096

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There are a number of preserved locos that have modern electronic AVRs (Automatic Voltage Regulator) that they were never fitted with so certainly people out there who are more than capable of doing such things.
Indeed. 41001 was one such and it also had Class 57 traction control electronics in it.
 

TheEdge

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Wouldn't you just isolate it if it went wonky - are 58s/60s really going to need it on a preserved railway?

It would depend on how critical it is to other systems on board. Hypothetically you may be able to take it out but then the brake system as a whole might start freaking out because its totally lost a component.
 

Bessie

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There's also the angle of what is ideal traction on a heritage railway. Class 33's have done well in this regard as they satisfy the "goldilocks" principle for many lines, not too big and not too small - ie: can pull 6 coaches easily at line speed 25-30 mph, good axle weight to avoid too much wear on track and sound good.
 
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