Chance would be a fine thing up Filton Bank or Box.
Box not a problem as it is east of Bath where electrification would finish until Bristol resignalled. Filton Bank would only be a problem up hill as a contributor joked about earlier.
Both now academic if "get-you-home" facility only allows 30mph. I understood it was a higher speed with the ability to restart on the 1 in 70 gradients in Patchway and Severn Tunnels.
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Quite apart from there being no certainty (yet) about electrification west of Cardiff this idea would simply exacerbate the operation of diesels under the wires.
Not at all. Only transient on the GWML but would eliminate HSTs under the wires on ECML now by introducing a dozen bimodes here first.
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For the first service group quite feasible, for the second group less clear. Again gradients come into the equation. HSTs over the South Devon banks are a known quantity but bi-modes have yet to be tested in the various possible failure configurations there. It's an issue that might eventually tip the balance in favour of a Dawlish avoiding line engineered to modern standards instead of Brunel's failed atmospheric concept.
Surely this will be established by early testing of the first bimodes in South Devon.
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