By my reckoning, most FCC units will be released. The 86 319's, and the 23 377's are the most obvious units that become available, but also as Thameslink will swallow up most services on the GN side, and the Cambridge and Kings Lynn fasts are going over to IEP, that's most GN units released, with the exception of the 313's. Personally what I would do, is send the 365's to FGW, and move the 321's to NXEA, with FCC keeping the 317's as I'm sure there may one or two peak time extras starting at/going to Kings Cross. There could be say 10 in use a day, two 12 car formations, and 2 8 car formations, and 2 spare. The 319's by now not having to go to FGW, could all go up North, which could kickstart a rolling programme of electrification.
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No need for the sarcasm, I was just advocating how I like them. But to commuters in the North West, under the 'Adonis plans' they're going to receive a radical refurbishment, so they will be thrilled to receive electric trains to a very decent standard.