I wonder when it's envisaged the 323s will leave Northern, given the franchise ends on 31st March, significant crews will have to be trained on the replacement stock and the replacement stock may require timetabling changes depending on it's top speed and acceleration (which would ideally be done in December or May.)
December 2017 is the date that London Midland expect to need additional electric stock in the West Midlands for the likes of the Chase line.
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In the north, anything with the Desiro name on it would go to Siemens at Ardwick.
Does Ardwick depot have the capacity for an additional 17, or perhaps even 37, 4-car units, though? Would Siemens be willing to fund an expansion of depot capacity if not (Both genuine questions that I don't know the answer to, rather than rhetorical)?
Of course, if Northern were to take on all the 350/2s in the North West, presumably replacing some or all of their recently received 319s, wouldn't that leave the recently converted and reopened Allerton depot somewhat short of work if they were to be maintained elsewhere (and Ardwick does make sense from a maintenance and staff familiarity perspective)?
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Oh and as you've been told before no one travels end to end on the TPE service...
I rather think that to be a false claim. Having travelled on the service several times (from Glasgow to Manchester, by the way), quite a lot of people travel the full length of the route (well, nearly, at any rate: From Edinburgh/Glasgow as far as Manchester Piccadilly, if not as far as Manchester Airport). I don't think that the 350s are suitable for the route but I still value a direct train over the faff of having to change at Preston or wherever: I suspect that many passengers are the same.