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Journey by Journey / London to Didcot, Oxford and Banbury / Re: Trimode cl 769 to operate Reading to Oxford and Gatwick.
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on: March 05, 2022, 11:27:14
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Again, by analogy, the unlamented "Tadpole"units that once inhabited this route weighed in at 113t with a 500hp diesel and only one motor bogie.
Slipping was a minor feature of the Southern's EE507, big traction motor, single motor car policy - part of the reason the 508's were banished to Merseyside.
The other problem is the perennial Diesel electric problem, that the generator/alternator produces more power at "right away" than the TM‡'s can use, leading to excessive windings' temperature rise. I think the 47's had a minimum continuous speed of 27mph to avoid TM damage, which limited their freight use.
What it does mean is that the makers need time to get even an adaptation right before launching anything new into service and making the public or at least the TOC▸ 's driver managers put up with an unfinished job.
OTC
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63
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Journey by Journey / London to Didcot, Oxford and Banbury / Re: Trimode cl 769 to operate Reading to Oxford and Gatwick.
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on: March 04, 2022, 17:30:22
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A train's performance on a gradient does not depend on whether it is diesel or electric but on its adhesion and therefore tractive effort. This in turn depends on axle load, number of driven axles and rail conditions, where friction can vary typically between 12% and 30%. A diesel might be less inclined to slip as it could not lay down as much power as when under electric drive.
There are a number of c1:100 gradients at the Eastern end, the worst is 1:96, not the 1:40's experienced in the Pennines!
OTC
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Journey by Journey / London to Didcot, Oxford and Banbury / Re: Trimode cl 769 to operate Reading to Oxford and Gatwick.
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on: March 03, 2022, 11:29:49
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The d.c. traction motor and pneumatically operated doors are not exactly key NASA space technologies. There is a little more excuse for software but that has had decades on the learning curve.
The 769 problems say more about present UK▸ rolling stock engineering expertise than they do about the relatively simple 319 stock. This should last indefinitely, like the 4SUBs which went to the torch in full working order with only wear and tear maintenance over their (several) lives.
OTC
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65
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Journey by Journey / London to the Cotswolds / Re: Overhead Electrification Plans
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on: December 19, 2021, 16:26:21
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It might help to consider the "dripping tap" approach to wiring presently occurring.
There are definite schemes progressing at least between:
Man Vic and Stalybridge Stalybridge and Guide Bridge Huddersfield (West) and Dewsbury Dewsbury "right through to Leeds" Colton Jn and Church Fenton (North) Lostock Jn and Wigan Wallgate Leeds and Bradford Int Glendon Jn and Market Harborough (reported that one crew erected 29 masts in a single possession) East Kilbride. Cardiff Valleys
Only some have been "announced". Others have just started piling without fanfare. Yet others are either promised or included in budgets such as MML» and Midlands Engine. Perhaps we'll see something nearer us soon, the Oxfordshire LEP» is the key.
There'll be a lot of pan upping and downing if the gaps aren't filled!
Greetings,
OTC
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66
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All across the Great Western territory / The Wider Picture in the United Kingdom / Re: Union Connectivity Review published
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on: November 29, 2021, 23:02:07
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His career was one of serious corruption of local government, aided by it being a one party sub-state. The issue of regionalism was voted on nearly two decades ago so the memory was fresher. Fading memories mean lessons have to be re-learned.
Westminster is not an English rotten borough as there is enough transparency and shared oversight to expose many of the abuses of any party. Rottenness happens under Labour as well.
The relevance to railways is that large rail contracts would be let purely locally. At least the GWEP▸ overspend was a result of incompetence not of cronyism.
OTC
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67
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All across the Great Western territory / The Wider Picture in the United Kingdom / Re: Union Connectivity Review published
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on: November 29, 2021, 17:36:24
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I think what you are really advocating is Regionalism, something that John Prescott failed to get adopted, largely because the prototype in the North East would have become a Labour Rotten Borough - something most Labour voters recoiled from - remember Newcastle's T Dan Smith?
There were sort of Regional assemblies and a Government Office for the South East, about the same size as the devolved Nations (in Britain at least).
So we are back to England being run from Westminster (i.e the South East).
OTC
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68
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Journey by Journey / Portsmouth to Cardiff / Re: There's something about Bradford
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on: November 21, 2021, 18:44:41
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I think that RSSB▸ SD001 refers.
All three power units were TDM/RCH fitted although the 125 originally had a 36 way jumper. The ETS▸ had to come from the 125 as it was 415/3/50, not 1000V/600A.
The Southern was the master of this sort of thing, with weird consists all plugged together with 27 way jumpers, all motored!
Apologies for abbreviations.
OTC
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All across the Great Western territory / The Wider Picture in the United Kingdom / Re: HS2 - Government proposals, alternative routes and general discussion
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on: November 21, 2021, 14:56:44
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I would at least, list every Midland Station from St Pancras to Sheffield. They would now have full AT electrification and doubtless a better timetable.
Additionally, HS2▸ trains would directly reach Derby, Nottingham and Sheffield Midland stations.
Also, connecting services to these points would now act more as feeders.
I agree that there's work to do in and for Yorkshire but we need an integrated HS2 not a cuckoo, divorced from the existing network, with timetable footnotes of, "passengers make their own way between x and the HS2 station".
OTC
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