jimbo
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Post by jimbo on Jun 26, 2019 4:32:44 GMT
I looked at bogie overhang dimensions on S-stock gangway ends to see how much shorter than standard LUL dimensions was required to reduce excess movement between cars.
In consequence I discovered that whilst on most S stock cars the body end is at 2307mm, the cab cars have a 3057mm distance from centre-pin to body end at the gangway end.
Does anyone know how this came about, and why the extra 700mm was not shared out through the train to give a standard dimension?
And has anyone noticed a different ride in this gangway due to the extra and uneven movement between the two cars?
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Post by goldenarrow on Jun 26, 2019 15:19:29 GMT
S stock DM cars are longer by circumstance because they have to accommodate the cab itself which has not only has lengthened the lead/end car but has also given us the shorter set of doors immediately behind the cab. However, the distance between bogies is the same for all cars which of course means that DM cars have a greater degree of overhang which would mean that they would lurch a bit more not being coupled at one end.
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jimbo
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Post by jimbo on Jul 5, 2019 1:36:30 GMT
As GA says, the end cars are almost identical to others for passengers, but with a cab added making them longer. But the inter-bogie distance remains the same. This means that the bogies are not centred under the end doorways as on other cars, but are offset by 805mm. This must result in a slight increase in PTI gap at curved platforms, the standard cars being ideal. So these adjacent car ends appear identical to passengers, but one car end pivots from 750mm further away than standard car ends. As previously asked, has anyone noticed a different ride in this particular gangway due to the extra and uneven movement between the two cars?
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Post by t697 on Jul 5, 2019 5:35:14 GMT
The ride in the DM car ends must indeed be marginally worse than other car ends, but whilst you may be able to instrument and record that difference, I doubt that the majority of passengers could tell the difference in a blind test. In any case I am pretty sure it still passed the relevant type test. I ride at the car ends sometimes and it hasn't bothered me.
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Chris M
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Post by Chris M on Jul 5, 2019 11:04:57 GMT
I'm not an every day traveller on the SSR but when heading eastbond on the District through Z1 I'm often at the very back of the last car (for the stairs down to the Northern and DLR at Monument) but rarely at the extremes on other journeys. I've never noticed a difference.
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Post by goldenarrow on Jul 6, 2019 22:00:58 GMT
Chris M , The Northbound run of the MET line from Baker Street to Wembley Park seems to me to produces a notable difference. In particular the NB through Neasden where for years there was a characteristic hump in the track form halfway down the platform, it’s now moved to the bridge carrying the North Circular over the points to Neasden Depot but I’m sure you feel it more in the lead/tail cars as opposed to middle cars.
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Chris M
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Post by Chris M on Jul 6, 2019 22:36:01 GMT
It's not often I travel on that bit of railway, but when I do I'm almost always heading to Uxbridge and so can't remember the last time I travelled anywhere other than the leading end of the first car.
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