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I remember the Carmarthen to London Waterloo services, saved my skin many a time, they offered a later service to London than Great Western did, although it was always packed out by the time it left Cardiff.
Tunnels would probably be OK, just wouldn't clear the platform faces at Farringdon. They used to have steam-hauled goods through that tunnel and the ELL, no condensing gear IIRC, that can't have been fun for the crews.
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