In message . com, at
06:35:54 on Mon, 5 Jun 2006, John B remarked:
No, the Jubilee is in a tube tunnel,

... two tube tunnels...

Getting a tad pedantic.

and the Metropolitan is in traditional surface/cut-and-cover.

I thought that the Met was in one or two tube tunnels for some of the way,
although it seems to be cut and cover at the airhole in Swiss Cottage.

The Met is certainly in two tunnels for some of the way; presumably
these sections are bored rather than C&C, unless there's a reason I've
missed why it would make sense to have twin cut-and-cover tunnels.

The Met goes over the Regents Canal, but most of the rest is in tunnel.
Some of it may well be bored.
--
Roland Perry