The Cathedrals Express tours stop at Canterbury to let passengers view the Cathedral.
They then pass through Dover on their way back to London and usually stop at Folkestone West to take on water.
This is Tangmere storming through Dover Priory:
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And this is Oliver Cromwell in the same location:
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This is Oliver Cromwell taking water at Folkestone West:
http://shipsintheportofdover.fotopic.net/c1731207.html