Yeh, 'dft' to work with gtr in replacing the gat ex units when they return' was basically the wording on the staff brief.
I have heard other rumours that the 379s will end up at GN with all the 387s and 377/5 transferring to Southern to replace the 313 and 455s fleets by December. Same place i heard about the remaining 365 being retired a couple of weeks ago, so there maybe legs in it.
There’s a lot of sense in that happening, as the 29x GN 387, plus the 6x LTS ones, plus the Gatwick units and plus the 377/5 would just about be enough to get rid of the 313s and 455s. The 707s could displace Networkers (10 car vice 8 car giving a slight capacity boost on the metro network) which could backfill the 377/5s.
This would leave GN about 20x units short though. Could the 365s then find themselves being re-leased on dirt cheap terms on the basis that any lease is better than storage costs, perhaps with bodyside cameras thrown in (the need for wayside DOO equipment being their biggest bugbear at the moment)? Just a thought.
GN can manage without the 20 units now and still run two peak Peterborough services. They might just be able to squeeze another in, perhaps another if they drop them all to 8-car, but beyond that they will struggle. They could do the Baldocks with the surplus 700/0s, but only until the peak Welwyns return. One way or another, GN won’t be able to manage with just the 379s in the medium term, unless passenger numbers remain badly down.
To give some context:
313+455 is 65 units
365 is 21 uni
387/1+387/2+LTS is 62 units
377/5 is 23 units
379 is 30 units
If the 313, 455 and 365 fleets go this is 86 units.
If the LTS 387s, 377/5 and 379s join this is 59 units joining. Quite a shortfall, even allowing for reduced numbers.
Add in the fact that the 365s are unlikely to find use elsewhere (the only pre-1990s EMUs remaining would be the Scotrail 318/320 fleet), and it does kind of make sense to have them back on GN and focus on binning the 313/455 instead.
A lot depends on passenger numbers of course.