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Post by Deleted on Dec 19, 2015 6:31:55 GMT
Hi
Today 19th I saw a Bakerloo 72TS at Neasden does anybody know why it's there is it going for scrap?
Note I could not see the number at the time.
Cheers
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Post by Dstock7080 on Dec 19, 2015 7:09:11 GMT
Hi Today 19th I saw a Bakerloo 72TS at Neasden does anybody know why it's there is it going for scrap? Note I could not see the number at the time. Cheers Returning from the engineering modifications taking place in Acton Works. None are going for scrap just yet. |
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Post by crusty54 on Dec 19, 2015 7:11:15 GMT
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cso
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Post by cso on Dec 19, 2015 10:37:17 GMT
From the picture" Train 760, 10:30 Acton Works to Neasden depot via Ruislip, Amersham and Watford"
That seems an awfully long route to me to get from Acton to Neasden?
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Chris M
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Post by Chris M on Dec 19, 2015 12:48:32 GMT
I presume the Watford call is to get the train the right way round, there is nowhere between Nesden and the Bakerloo line to do so.
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rincew1nd
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Post by rincew1nd on Dec 19, 2015 15:23:49 GMT
I presume the Watford call is to get the train the right way round, there is nowhere between Nesden and the Bakerloo line to do so. That suggests that the train worked out that way too, otherwise it will come back the other way around to that which it went. Amersham seems a little excesive (HWMBO: Amersham is never excessive, sensible shoes and a good trouser are the ways), could it not have reversed at Ricky, or was this perhaps a little Christmas jolly for the train crew? |
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Post by whistlekiller2000 on Dec 19, 2015 15:49:29 GMT
sensible shoes and a good trouser Magnificent! Tell HWMBO he has a way with a phrase.  |
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Post by Deleted on Dec 19, 2015 18:48:28 GMT
From the picture" Train 760, 10:30 Acton Works to Neasden depot via Ruislip, Amersham and Watford" That seems an awfully long route to me to get from Acton to Neasden? It does. Why Ruislip & not Rayners Lane? And why Amersham, instead of Rickmansworth & Watford North Curve?
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Post by MoreToJack on Dec 20, 2015 0:06:25 GMT
The train ran Acton-Ruislip-Harrow-Amersham-Watford-Amersham-Neasden. It was (clearly) not turned.
The trip was for EMC testing and S stock integration, particularly with regards to regenerative braking and how the 72TS reacted.
For the record, it is the third life extension train, and is due to return to the Bakerloo in the "near future".
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rincew1nd
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Post by rincew1nd on Dec 20, 2015 0:19:12 GMT
The train ran Acton-Ruislip-Harrow-Amersham-Watford-Amersham-Neasden. It was (clearly) not turned. The trip was for EMC testing and S stock integration, particularly with regards to regenerative braking and how the 72TS reacted. For the record, it is the third life extension train, and is due to return to the Bakerloo in the "near future". That explains a lot, in particular the extra Amersham visit, thanks Jack. However, it also raises the question as why would a 72ts need compatibility testing with S Stock (I'm guessing so the post-refurbishment runs can be done with minimal faff), and what's an EMC? |
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Post by Deleted on Dec 20, 2015 5:49:10 GMT
More generally, though, I would say that Amersham is a preferable place to reverse such a train than Rickmansworth. For the north to south at Rickmansworth you probably wanna go wrong road off platform 1. You can arrive in platform 2 from the south and go back, but that's a big faff. The problem with the wrong road move off of platform 1 is that, all the while you're changing ends and then waiting for a path, you're in the northbound platform. Also, the crossover is close to the platform and I don't believe JP1 (southbound home) can clear whilst 27 points (the crossover) are locked reverse for the move, because the overlap extends over the crossover. So you clobber the southbound as well.
Now Amersham, Amersham is lovely - you've got the second northbound platform for the Chilterns to use if your train is waiting in platform 2 and you've got two lovely sidings - and it's rare for both to be needed off peak - so Amersham really is the obvious choice. It's much easier to slot the train into a path as well - partly cause it's safely ensconced in a siding, but also because the slots are there. For a start, you don't have the Cheshams, which leave you with another train to fit between, but, also, because you can have the ECS train just follow on behind one and it doesn't matter so much at Amersham, because there's very rarely something closely approaching on the south to hold up. Just 2 Chilterns per hour.
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Post by br7mt on Dec 20, 2015 15:45:56 GMT
EMC is electromagnetic compatibility, essentially how electromagnetic fields generated at the switching frequencies and voltages of the S Stock when using the regenerative brake affect the traction and auxiliary systems on 72TS. I think the principle risk is the MAR - it being set for traction voltage levels seen on the Bakerloo line and therefore when it gets a 790V kick as a 'receptive' train the 50V dc and 110V ac outputs will be higher, leading to risks such as battery gassing etc.
The effects will be more pronounced when the SSR goes to 750V as the regen voltage jumps up to 890V. Whether that means a repeat test or a prohibition on Bakerloo 72TS inter-running with S Stock I don't know, although I suspect the latter.
Regards,
Dan
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Post by Deleted on Dec 20, 2015 18:24:18 GMT
I presume the Watford call is to get the train the right way round, there is nowhere between Nesden and the Bakerloo line to do so. A prototype for everything as my Watford Clarendon Road layout will have Met. and Bakerloo line services serving it! XF |
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Post by spsmiler on Dec 21, 2015 23:14:40 GMT
So we must assume that at some point during the night after passenger services on the Jubilee Line had finished the train used the (nowadays little used) direct connection to the Bakerloo Line at Baker Street.
Simon
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Post by plasmid on Dec 21, 2015 23:48:47 GMT
Someone mentioned somewhere a while back that all trains were supposed to be rated to handle 1,000v no? Or is that just for more modern trains?
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Post by Deleted on Dec 22, 2015 10:11:26 GMT
So we must assume that at some point during the night after passenger services on the Jubilee Line had finished the train used the (nowadays little used) direct connection to the Bakerloo Line at Baker Street. Simon Yes, both ways. There was a transfer from the Bakerloo to Acton Works as well and that one was booked to go all the way and not stop off at Neasden. |
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