If Chiltern ever orders a batch of locomotives from Vossloh, couldn't there be a follow on order for five locomotives for FGW to replace the 57s? This would make sense given that the sleeper is now part of the franchise specification.
Possibly, but in this country we have thirty class 67S, about 12 years old, for whom the work they were built has disappeared. Virtually all EWS's own work can be done with 75mph non ETS class 66s.
I believe current class 67 usage is (approx)
Three dedicated to special EWS use (royal train and managers set)
Four EC thunderbird
One ATW (wag express)
Two scotrail fife circle
Three scotrail sleeper
Three (?) Chiltern mainline
That's 13ish in use out of 30. Allowing a further four locos to be either on exam or spare to replace the above, that gives 13ish locos theoretically available for use elsewhere in this country.
Are 57s really as bad as people think though?