|
|
Post by d7666 on Apr 6, 2020 20:39:33 GMT
Interesting comment about batteries weight on the rebuilds .... is it right though .... I'm genuinely asking the question because IIMU each time batteries are replaced [which has always been more often than once every rebuild] the decreasing weight and size per cell as manufacturing becomes more efficient has each time allowed more cells to give a greater overall battery capacity in Amp-hr. I have a whole list of battery values over time, ever since the first 1930s build, not to hand, I'll have to dig it out, and there is a continuous upwards drift. The recent rebuilds are the largest in terms of Amp-hr but smallest size per cell with more cells[?]. But I still thought the more of these smaller cells makes the overall weight more or less the same. Is it perhaps some other kit has been removed at rebuild ? The cab has been increased in length both ends, meaning full sized batteries were replaced with 1/2 sized replacements in the 2 battery bays nearest the cab on both ends. ahh yes, now you say that, yes the cabs were lengthened backwards, forgot that. I was only thinking in terms of battery, forgot the space was smaller. |
|
metman
Global Moderator
5056 05/12/1961-23/04/2012 RIP
Posts: 7,421
|
Post by metman on Apr 7, 2020 20:17:29 GMT
Which traction motors do they have? Something similar to WT54 on the pre-1938 and Q stock? Stand to be corrected but AFAIK today they are all (slightly) modified WT54s. I think the mod might simply be that any armature or carcass overhaul would have brought them up to the latest contemporary insulation standard, which tends to alter a motors characterstics. The 1938 batch as built had MV 145AZ motors, don't know if they got exchanged. The MV 145 AZ motors were used on the O/P Metadyne stock so that makes sense. |
|
|
|
Post by countryman on Apr 7, 2020 21:13:53 GMT
Stand to be corrected but AFAIK today they are all (slightly) modified WT54s. I think the mod might simply be that any armature or carcass overhaul would have brought them up to the latest contemporary insulation standard, which tends to alter a motors characterstics. The 1938 batch as built had MV 145AZ motors, don't know if they got exchanged. The MV 145 AZ motors were used on the O/P Metadyne stock so that makes sense. According to my book L41, 42, 43 were built in 1937 with MV Metadyne equipment, the 1938 batch were L35- 40 with GEC equipment. The way they appear to be numbered seems odd as the older ones have higher numbers. Or is my book wrong? |
|
|
|
Post by d7666 on Apr 7, 2020 21:42:51 GMT
From WORKHORSES OF THE LONDON UNDERGROUND (might be the same book!), L41-L43 had MV (metadyne) control equipment, and, not quoting numbers "the other six" (so must be L35-L40) GEC control resistance equipment. Only the control eqpt from GEC.
Later on, it states all 9 all had MV145 traction motors.
The appendix gives delivery date
L35 25/02/38
L36 04/03/38
L37 11/03/38
L38 18/03/38
L39 29/03/38
L40 12/04/38
L41 29/11/37
L42 20/12/37
L43 25/01/38
It's nothing unusual for out of numerical order deliveries of anything, especially where two different contractors are involved.
|
|
metman
Global Moderator
5056 05/12/1961-23/04/2012 RIP
Posts: 7,421
|
Post by metman on Apr 8, 2020 10:51:04 GMT
The locos with Metadyne equipment received them from the saloon stock test train scrapped in 1936. Some of the bogies were taken too. In fact L35 in the Acton Depot still has its 7ft Fox bogies!
|
|
|
|
Post by norbitonflyer on Apr 8, 2020 15:35:32 GMT
From WORKHORSES OF THE LONDON UNDERGROUND (might be the same book!), L41-L43 had MV (metadyne) control equipment, The appendix gives delivery date L35 25/02/38 L36 04/03/38 L37 11/03/38 L38 18/03/38 L39 29/03/38 L40 12/04/38 L41 29/11/37 L42 20/12/37 L43 25/01/38 That fits with Brian hardy's "Underground Train File", which shows saloon motors 2521/22/24/29/30/35 to have been fitted with Metadyne equipment towards the ends of their lives. The cars' Met Rly numbers had been 24,25,37,43,54,and 47, all from the second (1906) batch, originally built for the Circle and Uxbridge electrification projects. 2530 was withdrawn in March 1937, and the rest in June of the same year. (Each battery loco would have used the equipment from two motor coaches). |
|
|
|
Post by d7666 on Apr 8, 2020 16:15:04 GMT
Getting back to the Pickering batch, WORKHORSES OF THE LONDON UNDERGROUND has delivery dates
L55 08/01/51
L56 20/03/51
L57 29/05/51
L58 17/07/51
L59 19/09/51
L60 19/11/51
L61 30/04/52
= for the first 6 is a remarkably steady 1 every 2 months delvery.
Is there any record on how they were physically delivered, it's a long way from the Clyde to the Thames. Bodies built in Glasgow and fitted to bogies at Acton ? Moved by rail on transporter bogies or on rail wagon or road low loaders ? l
Apart from some less precise gen posted upthread, can anybody match their withdrawal dates with similar precision to the delivery dates ?
And, digressing again, withdrawal dates for the 1985 locos (although I think I'd be right in suggesting the official withdrawal dates will be way different to their stopped working dates! )
--
Nick
|
|
