On Feb 28, 12:49*am, Charles Ellson
wrote:
On Mon, 27 Feb 2012 01:40:17 -0800 (PST), amogles
wrote:

On 25 Feb., 18:13, D7666 wrote:
Ohh yes there is.

It is an out of gauge load.

Much *easier to path an out of gauge load *along a line with no
passing traffic than anywhere else.

Is sub-surface Underground stock built to a wider loading loading
gauge that NR stock?

Or what is it that makes it out of gauge?

LU surface stock goes out of gauge on curves (and thus within
platforms if using a crossover). IIRC it is not actually out of gauge
on straight track but is the only stock (apart maybe from some 3rd
rail stock from which shoebeams have not been removed ?) which will
utilise certain parts of the available gauge so that an intruding
obstruction will be missed by most NR trains but could be struck by an
LU train being dragged.
Taking a quick look at e.g. :-http://www.joyce.whitchurch.btinternet.co.uk/clear950.gif
the same might equally apply to tube trains whose floor level is
closer to the ground.

Metropolitan Railway Cars were wider at the Sole Bar than other
British main land rolling stock. North of Quainton Road, Met. Cars
were out of guage towards Calvert, but within guage towards Verney
Junction. "A" stock took advantage of the wider availability. I
cannot speak to "S" stock.