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Post by Deleted on Mar 23, 2014 18:10:56 GMT
I travelled on the Piccadilly Line today and could not help but notice that most empty seats on the train I was on appeared to inflate when the train was in motion and in a tunnel section. i have never noticed this happening on any other train - any ideas what causes this phenomenon?
XF
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Post by whistlekiller2000 on Mar 23, 2014 18:34:22 GMT
I travelled on the Piccadilly Line today and could not help but notice that most empty seats on the train I was on appeared to inflate when the train was in motion and in a tunnel section. i have never noticed this happening on any other train - any ideas what causes this phenomenon? XF Nige, Assuming you weren't on the way back from a proper session at the pub and hallucinating wildly, I'd guess it has something to do with air pressure variations. Did it do it above ground? Rich' |
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metman
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Post by metman on Mar 23, 2014 18:43:20 GMT
There is probably air coming through the chassis gaps behind the seat risers perhaps making this happen?
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Post by John Tuthill on Mar 23, 2014 19:06:54 GMT
I travelled on the Piccadilly Line today and could not help but notice that most empty seats on the train I was on appeared to inflate when the train was in motion and in a tunnel section. i have never noticed this happening on any other train - any ideas what causes this phenomenon? XF Nige, Assuming you weren't on the way back from a proper session at the pub and hallucinating wildly, I'd guess it has something to do with air pressure variations. Did it do it above ground? Rich' Or did the motorman have a curry?  |
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Post by Deleted on Mar 23, 2014 20:33:14 GMT
Nige, Assuming you weren't on the way back from a proper session at the pub and hallucinating wildly, I'd guess it has something to do with air pressure variations. Did it do it above ground? Rich' Or did the motorman have a curry? Often behind the leading cab too! I've noticed this too and you can take advantage of this on a hot summers day, just sit on the one that seems to be inflating the most and you get a nice ventilated seat! |
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Post by Deleted on Mar 23, 2014 21:12:51 GMT
You do tend to get catapulted into the air if a slightly larger person sits down next to you!
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Post by Deleted on Mar 23, 2014 21:17:57 GMT
You do tend to get catapulted into the air if a slightly larger person sits down next to you! That's 72 stock  |
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Post by Deleted on Mar 23, 2014 21:33:57 GMT
Oops!
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Post by Deleted on Mar 23, 2014 22:47:29 GMT
Thanks to all- It was quire amusing as we made our way back from the Ally Pally model rail exhibition stone sober!
Nigel.
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Post by version3point1 on Mar 28, 2014 15:33:14 GMT
whistlekiller2000 and metman have the closest answer, but it's all to do with the changes in air pressure, and certainly in the DM cars, whilst the seats have plastic bottoms moulded around the bottom of the seats to stop the air getting through the seat cushion (which is just a frame of springs with a bit of padding and then the moquette tightened and fixed onto it), all that's stopping the air getting in from underneath is a metal plate (which we can lift) that covers the shoegear, BIC and BRV. The last time I had the misfortune of lifting those seats up to stick my head down there into the void, it became apparent how large a hole one is sitting over because you can see straight down to the track!
Been trying to find a picture from my stock training to better illustrate (where we get to lift seats left, right, and centre) but can't find one at the mo. Sorry!
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Post by norbitonflyer on Mar 28, 2014 16:39:09 GMT
the seat cushion (which is just a frame of springs with a bit of padding and then the moquette tightened and fixed onto it), all that's stopping the air getting in from underneath is a metal plate (which we can lift). ............how large a hole one is sitting over because you can see straight down to the track! Been trying to find a picture There's this one (1972 stock) which shows how packed-in everything is www.rmweb.co.uk/community/index.php?/gallery/image/59016-1972ts-car-3511-at-acton-works/ |
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Post by Deleted on Mar 29, 2014 2:24:36 GMT
I travelled on the Piccadilly Line today and could not help but notice that most empty seats on the train I was on appeared to inflate when the train was in motion and in a tunnel section. i have never noticed this happening on any other train - any ideas what causes this phenomenon? XF The beloved 1967 stock trains used to bounce up and down especially between King's Cross & Seven Sisters when the train was travelling near full speed! It was rather a shock when I first 2009 train and the train seemed to glide across the track! |
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Post by Hassaan on Mar 29, 2014 3:17:30 GMT
I travelled on the Piccadilly Line today and could not help but notice that most empty seats on the train I was on appeared to inflate when the train was in motion and in a tunnel section. i have never noticed this happening on any other train - any ideas what causes this phenomenon? XF The beloved 1967 stock trains used to bounce up and down especially between King's Cross & Seven Sisters when the train was travelling near full speed! It was rather a shock when I first 2009 train and the train seemed to glide across the track! Just goes to show how much better the ride quality of modern trains is. I know it happened with the A/S Stock on the Metropolitan, and have also noticed it between the South West Trains Class 455/450. I took the non stop 1923 Waterloo-Surbiton service formed of a 455 (slows down around Clapham Jn but line speed either side on the SWML) and got bounced all over the place, but returned on a 450 (that only called at CLJ) and was a much smoother ride. |
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Post by Deleted on Mar 29, 2014 15:47:05 GMT
The beloved 1967 stock trains used to bounce up and down especially between King's Cross & Seven Sisters when the train was travelling near full speed! It was rather a shock when I first 2009 train and the train seemed to glide across the track! Just goes to show how much better the ride quality of modern trains is. I know it happened with the A/S Stock on the Metropolitan, and have also noticed it between the South West Trains Class 455/450. I took the non stop 1923 Waterloo-Surbiton service formed of a 455 (slows down around Clapham Jn but line speed either side on the SWML) and got bounced all over the place, but returned on a 450 (that only called at CLJ) and was a much smoother ride. The seats are much less comfortable now though! |
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