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Basil Jet[_3_] · May 30th 14, 09:19 PM posted to uk.transport.london

On 2014\05\30 21:26, d wrote:
On Thu, 29 May 2014 20:06:14 +0100
Steve Fitzgerald ] wrote:
In message ,
d writes
On a similar note - how far down the piccadilly line towards heathrow can
surface stock venture?

Hounslow Central; assuming S stock has now been cleared past
Northfields.

How would they clear it - is it all done in a computer sim or would they
actually drag a train down there at night to see if it bumped the scenery?

I suspect a tube gauge train with polystyrene bits stuck on the corners
and centres to make it simulate the size of an S-stock will have gone
first, but because trains swing as they move in a way which depends on
the suspension, weight distribution and speed, there is no substitute
for a real train travelling at real speeds, but I imagine they use sacks
of stuff to represent the weight of people.