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On Oct 20, 1:57*pm, Jamie Thompson wrote:
On 20 Oct, 12:47, Mr Thant
wrote:

On 20 Oct, 12:24, Jamie *Thompson wrote:

I was of the impression that the tunnel sections built were locations
where there would *not* be stations, and thus were normal running
tunnels, abet larger for the airflow related to higher speeds.

They are. A quick Google says 16 foot 6, which is about the same as
the Northern City Line runnint tunnels and slightly larger than the
Jubliee Line extension. Certainly not big enough for station tunnels.

(I'd guess that the diameter was chosen to accommodate two floors of
shelter rather than for a particular size of train)

U

As an aside for anyone else, I believe the reason the heavily
overloaded southern stretch of the Northern has the longest (planned)
chain of the shelters (Oval to Clapham South - 5 stations) was because
the intent for the express route was to continue westwards from South
Wimbledon and take over one/some of the National Rail lines from
Raynes Park, (probably calling at Wimbledon Chase). Hence the sharp
southerly curve to Morden en route to Sutton. I'd expect an express
line to stop at Kennington and Camden Town, so the shelter at Camden
Town is somewhat of an anomaly.

IMHO, a main line loading gauge, express, Northern Line still has
merits

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