"David A Stocks" wrote in message
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"Stephen Furley" wrote in message
...

It involved building a new fleet of trains
The new trains were fairly easy to justify, given that it allowed the 317s
to replace older stock (312s?) on the routes out of Kings X, and further
cascades to replace life-expired stock elsewhere.

IIRC when the 319s arrived on Thameslink the 317s went to Euston, replacing
the 310s. Subsequently 321s came to Euston, the 317s went to Kings Cross,
replacing the 312s.

Peter