...or free up diesel stock which play 3rd rail, like I say though I can't imagine there will be much to be gained as only 2, possibly 3 diagrams run above the juice rail. The Lymington flyer and 1 or 2 Hampshire locals.
Had a look through the current CWN's, and can find even fewer DMU over 3rd rail services than I expected, it's come down a lot since my last attempt at a list (repeated below).
The Lymington flyer 2.158 now comes down from Salisbury ECS each morning and at end of service on the branch provides the unit that does:
2T75 0030 Eastleigh to Portsmouth Harbour 0112
...stabling at Fratton depot overnight, it then runs ECS from Fratton to Totton, doing the first anticlockwise Romsey service of the day before entering the normal 3 train pattern to/from Salisbury.
Stabling that unit in Fratton to start the early Romsey services off may continue, and it doesn't really affect the 3rd rail 'issue' - although there must come a time before long where 158 driver knowledge at Fratton becomes a factor surely?
The other 3.159 covered services that I could find may be able to use a single unit.
2B91 1638 Winchester to Totton 1711
the above oddball service, previously mentioned in this thread, could presumably form 2T69 after running ECS back to Barton Mill from Totton:
2T69 2221 Basingstoke to Portsmouth Harbour 2340
This stables at Fratton and logically provides stock for the next day's:
2T14 0500 Portsmouth Harbour to Basingstoke 0620
(AFAICS it now goes off to Gillingham, it used to be a 6.159 and go onward to Waterloo at 0642).
Have I missed anything else? 'Corrections welcome' as they say...
I've dug out the early 2015 situation and copied it below for reference:
SWT DMU passenger workings over third rail - Dec 14 timetable
(Lymington Branch not included to save repetition, and I've grouped them by origin station.)
2L88 0642 Basingstoke to Waterloo 6.159 now 8.450
2B89 0655 Basingstoke to Southampton Ctrl 3.159 now 5.444
2B93 1724 Basingstoke to Southampton Ctrl 3.159 now 4.450
2T69 2221 Basingstoke to Portsmouth Hbr 3.159
2T75 0030 Eastleigh to Portsmouth Hbr 2.158
2T14 0500 Portsmouth Hbr to Basingstoke 6.159
2E24 0933 Portsmouth Hbr to Southampton Ctrl 3.159 now 4.450
2T92 1649 Portsmouth Hbr to Eastleigh 2.158 now 4.450 runs as 2T94
2B98 0542 Southampton Ctrl to Eastleigh 6.159 now 5.444
2E13 0751 Southampton Ctrl to Portsmouth Hbr 3.159 now 5.444
2B94 1817 Southampton Ctrl to Winchester 3.159 now 4.450
2B91 1638 Winchester to Totton 3.159
2B95 1905 Winchester to Southampton Ctrl 3.159 now 4.450