"MIG" wrote in message
...
On 13 Aug, 09:51, wrote:
On Wed, 12 Aug 2009 19:40:33 +0100

Paul Corfield wrote:

If apparently the 09 stock did get dragged through the piccadilly line
tunnels without incident then we can't be talking much difference
between
09 and other tube stocks can we? Maybe a few centimeters one way or the
other at most which surely wouldn't make much difference to equipment?

Did it arrive that way? I thought it was delivered by road rather than
rail and then across the tube network. I'd genuinely like to know the
answer to this so if anyone can point me at the facts it'd be good.

Thats what people on here were saying. I've no idea if its true. But it
occured to me that the victoria line uses an old piccadilly line tunnel on
the northbound at finsbury park and I very much doubt they would have
bothered to spend a fortune to enlarge it by a few inches so as 09 stock
has to fit through it must be pretty close to standard tube gauge.

B2003

Isn't it more to do with the bends rather than the diameter?



AIUI, the '09 units on test were road delivered. They are out of gauge for
other tube lines (we're talking maybe 20-25mm) with the appropriate
kinematic envelope for operational speeds. I suspect they could be crawled
through tight spots if the need arose. Current practice (as distinct from
past LT practice) would suggest little if any need for through operation on
other lines, and no plans to "cascade" stock.

Finsbury Park was extensively remodelled to provide UP-UP and DOWN-DOWN
train flows and cross platform interchanges between Picc and Vic. It
replaced the previous layout which provided for terminating GN&C trains of
"main line" loading gauge. The line of the Victoria route means that little
if any old Piccadilly running tunnel remains in use as such. As the Vic has
just been going through a rebuild from the track up, any minor structure
gauge anolomies would have been dealt with.

HTH

DW downunder