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Post by citysig on Dec 10, 2010 17:12:30 GMT
A recent visitor to our metals.The move was "planned" (well, in terms of it not being a mistake that the train ended up there. Multiple failures yesterday morning meant the train could not go from Rayners Lane to South Harrow in the normal manner, and we had to send it somewhere ;D Unfortunately I cannot take all the credit for being the first in a while to send a 73 stock to Harrow. My colleague had a different failure one night last week and also had to send a Picc onto the mighty Met Line ;D (Note 1 - I don't often post images, so if this breaks any of the size/link rules let me know - I did read the help topics thought. Note 2 - ignore the time inprint on the screen. The clock is still showing British Summer Time, so subtract roughly 1 hour.)
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Deleted
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Post by Deleted on Dec 10, 2010 17:34:54 GMT
Was this 360?
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Post by ruislip on Dec 10, 2010 18:19:43 GMT
Isn't HOTH the farthest a 73 stock can travel if it stays on the Met east of Rayners Lane?
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Post by trc666 on Dec 10, 2010 19:24:27 GMT
Was that empty stock or was it in service?
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Deleted
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Post by Deleted on Dec 10, 2010 20:41:12 GMT
Apart from official rules and regulations, what would stop a 73 stock going past Harrow?
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Post by 21146 on Dec 10, 2010 20:58:19 GMT
Apart from official rules and regulations, what would stop a 73 stock going past Harrow? They are only allowed between Uxbridge and Harrow-on-the-Hill. Banned elsewhere as post-refurb they have an auxiliary static converter not compatable with non-imunised Met signalling. |
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Post by t697 on Dec 10, 2010 22:03:08 GMT
They are only allowed between Uxbridge and Harrow-on-the-Hill. Banned elsewhere as post-refurb they have an auxiliary static converter not compatable with non-imunised Met signalling. With the replacement of all 33 1/3rd Hz track circuits and related immunisation work for S stock, the true limitation is possibly Jubilee line related. Also that no one has seen any need to review the availability south of Harrow for 73TS. The case for D78 stock's cab air con inverter is simply that if the train is not on the normal D78 route, the cab air con must be switched off. |
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Post by norbitonflyer on Dec 10, 2010 23:19:33 GMT
Also that no one has seen any need to review the availability south of Harrow for 73TS. Does that mean they can go north of HotH? Chesham shuttle perhaps? ;D The only reason I can think of for a 73 to go south of Harrow is if the Ealing & Harrow line was blocked for an extended period and stock trapped beyond the block needed to be got back to a Piccadilly depot. A route via Baker Street, Aldgate, and Earls Court would achieve this. A bit far fetched though! |
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Post by citysig on Dec 11, 2010 2:05:01 GMT
The train was Train 360 (first Picc from Uxbridge).
The train was running empty on departure from Rayners Lane.
Harrow is the furthest 73 stock can go - wheelbase length is the contributing factor to its restriction anywhere else.
Even if the rules were ignored, the wheelbase length could cause considerable problems in certain locations - in particular the entrance to Neasden depot.
Absolutely no chance of it doing the Chesham shuttle ;D
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Post by t697 on Dec 12, 2010 22:06:19 GMT
73TS and D78 have been involved in several test runs over the years on the Met. D78 has been used in the past occasionally for de-icing on the Met. Current restrictions list may well cite assessment of curves at Neasden being needed, particularly with all the changes going on there.
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Deleted
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Post by Deleted on Dec 12, 2010 22:17:06 GMT
Harrow is the furthest 73 stock can go - wheelbase length is the contributing factor to its restriction anywhere else. Even if the rules were ignored, the wheelbase length could cause considerable problems in certain locations - in particular the entrance to Neasden depot. I would assume the bogies on the trailers and motor cars are the same wheelbase. The TRT was at Neasden yesterday - is it the car length and bogie-to-bogie wheelbase that's the issue, with the DMs being slightly longer? |
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Post by t697 on Dec 12, 2010 22:24:35 GMT
73TS cars and bogie centres are pretty similar. I almost mentioned the Track Recording Car! It started out as a trailer and might have slightly more bogie rotation available or have been modified that way. Its route availability includes all or almost all passenger routes on LU - perhaps someone will tell us somewhere it isn't allowed.
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metman
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Post by metman on Dec 12, 2010 23:18:10 GMT
It can also work on the NR network. I would assume that its been altered in some way but I don't know for sure.
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Post by citysig on Dec 13, 2010 4:14:39 GMT
I would assume the bogies on the trailers and motor cars are the same wheelbase. The TRT was at Neasden yesterday - is it the car length and bogie-to-bogie wheelbase that's the issue, with the DMs being slightly longer? To be honest I've no idea, and normally these things take a bit of finding out. It may also be an issue with what is under the cars in terms of equipment, coupled with the length of each car. |
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Ben
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Post by Ben on Dec 14, 2010 1:04:08 GMT
AFAIA, the only problems that affect 73ts running on subsurface lines are the converter, and the 'blisters'. Wheelbase length is irrelevant, but they apparently are not currently gauged for a few other tube lines.
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Post by citysig on Dec 14, 2010 9:41:18 GMT
After having a bit more of a detailed read of the restrictions, it appears the main issue is not so much the length of wheelbase (although it is still a factor) but more to do with the Inter-Car Barrier equipment installed. They are restricted from operating on curves with a radius less than 71.3m, as presumably a curve any tighter than that would mean the cars would effectively foul each other where the ICBs are fitted.
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metman
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Post by metman on Dec 14, 2010 13:06:38 GMT
Good man! That makes sense. Come to think of it, the TRT no only is without ICBs but also the cars are coupled a little further apart than normal. They look like a model train with couplings that distance apart.
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