Alistair Bell wrote:

By the way, someone upthread mentioned that end doors are needed on
Thameslink -- really? Even in a double-track tunnel? But wasn't the
whole point of ordering 365s on both sides of the river that they were
going to run through? (Or is this the Prescottists instituting
pointless safety rules again?) I know that the GN&C tunnels are
single-bore and small enough that end doors are needed -- that seems
fair enough. But I didn't think that would apply to the Thameslink
tunnels. If you can run a Pendolino through Primrose
Hill/Shugborough/wherever without end doors, why can't you run a 365
through Thameslink? (What's the current status on running 365s between
Dover and Folkestone? Are they still banned?)

Indeed. An even more extreme example is running Pendolinos through the
single-bore down fast tunnel at Linslade - no end doors there! (Incidentally
when tilting at full speed they have only a couple of inches to spare on the
kinematic envelope through that tunnel, according to the latest MR.) Same
applies for 365s on the ECML tunnels near London between KX and Potter's
Bar - one of those tunnels has single bores on the slow lines I think, but I
forget which.

Angus