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Post by 1018509 on Jul 22, 2022 17:44:02 GMT
Pardon the memory loss of an old duffer but many years ago there were some new battery locomotives bought by what I imagine was then London Regional Transport. These locos weren't a success and spent several years in the sidings of West Ruislip depot visible from the Met/Pic Uxbridge lines.
What happened to them?
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Post by Dstock7080 on Jul 22, 2022 18:13:27 GMT
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towerman
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Post by towerman on Jul 22, 2022 22:23:32 GMT
Think they didn’t work well with long welded rail units.
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Post by t697 on Jul 23, 2022 17:22:41 GMT
I had an assignment on these locos during design and delivery. I'd be interested in what the deficiency was when working the LWR train.
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class411
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Post by class411 on Jul 24, 2022 8:37:37 GMT
The thread title seems a little at odds with the content if the units were from 37 years ago.
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Post by 100andthirty on Jul 24, 2022 10:31:41 GMT
The thread title seems a little at odds with the content if the units were from 37 years ago. They were newer than the old locos. LU has looked at newer locos more recently but cash has always been a issue and it's always been much cheaper to upgrade the 1964/1973 locos. The 1985 locos were really poor for several reasons: 1) they were less powerful than the old locos - a bit of a snag when the old locos weren't all that powerful. They were built around reclaimed CO/CP stock motors which were less powerful that the Q stock type used on the older trains; 2) they were more technologically advanced than the old locos, which required a major uplift in skills for the maintainers - but there were only ever 6 of them which meant that many never really used their skills and 3) they weren't all that reliable. This led the Transplant folk to rely more and more on the old locos and they realised that they could deliver all that was required without the new ones. Hence the new ones being displaced. |
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Post by d7666 on Jul 24, 2022 12:17:29 GMT
Question, not a statement, about the time line : weren't all 6 stopped and out of use (even if not withdrawn) before Transplant was formed ?
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Post by t697 on Jul 24, 2022 12:29:13 GMT
Pretty sure that's true, but the previous stewards of the locos still made that decision based on what has been cited above.
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Post by t697 on Jul 24, 2022 12:39:30 GMT
They were certainly slightly lower power rating motors on the standard 1 hour rating. However for starting tractive effort, they should have been adequate based on calculations at the time. There was an overall notching current control though whereas the older locos can be hand notched to any current within the overload relay settings! We calculated that the setting was adequate for all the performance cases in the specification including pulling rails off the LWR train, but maybe it wasn't in practice.
Or maybe the performance cases didn't cover things properly. Given the project team involved and the general difficulty of defining relevant performance cases, I wouldn't be surprised.
My recollection is that your items 2 and 3 were the key ones for getting them out of service.
They were certainly too complicated and this was in part because the introduction of Line Clear/Line Safe hadn't been taken into account by the loco specification's guiding mind. This meant that the battery is only used at the worksite so much of the complexity was pointless.
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Post by 100andthirty on Jul 25, 2022 9:51:31 GMT
I suspect your first point is relevant. Hand notching could give a bit of extra oomph (a technical term!) which the automatic notching wouldn't have allowed.
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metman
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Post by metman on Jul 29, 2022 21:11:13 GMT
Thanks for the replies very interesting. I guessed the older locos used similar kit to the old Q stock WT54Bs but had no idea that the 1985 locos used former MV motors off the CO/CP stock!
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