"Roland Perry" wrote in message
.uk...

But WAGN have many 317s as well. They could run the stoppers, which tend
to be 317s [during the week, at least; after all, the people who get the
stoppers are second class citizens and don't deserve the newer stock]
through, and have the fasts shuttling back at KX.

Unfortunately the 317s are not dual-voltage so, although they are permitted
through the tunnels, they wouldn't get much further than Farringdon (at
present the limit of 25kV ac catenary, although City Thameslink is proposed
to be the changeover point under TL2000).