Bridport went from a three car dmu, to a bubble car just before closure. Traffic was virtually non existent come closure.Locally these closed routes could probably have been retained with a bit of foresight:
Mid Hants.
Rationale: Alresford is a reasonable sized town in itself, plus it's a useful diversionary route and it opens up connectivity from the Farnham area to south Hampshire.
Suggested service if it hadn't closed: electrify, and extend one of the two half-hourly VEPs to Alton, to Southampton Central via Winchester calling at all stations.
Swanage.
Rationale: Potentially carries huge traffic in the summer months, granted there is a marked seasonal spike but it would also allow local commuting into the Bournemouth area.
Suggested service if it hadn't closed: hourly service from Bournemouth.
Hythe and Fawley.
Rationale: Large population in the area, with much of the housing built before closure. Of course there continues to be talk about it reopening.
Suggested service if it hadn't closed: hourly service from Southampton Central.
One route north of Bournemouth, EITHER the Somerset and Dorset, as far north as Evercreech Junction (thereafter, rerouting via Westbury could have taken place) OR the Salisbury route. If cost cutting was desired, only the larger settlements could have had stations retained (i.e. Wimborne, Blandford and Templecombe - for connections - on the S+D, or Fordingbridge and Downton on the Salisbury route).
Rationale: connectivity north and west of the Bournemouth/Poole area has been poor since.
Suggested service: two-hourly service to Bristol Temple Meads from Bournemouth, with hourly service at the southern end (i.e. Bournemouth-Salisbury or Bournemouth-Blandford, depending on route chosen).
Which? - not sure. On balance I'd say Salisbury; Bournemouth to Salisbury alone would probably generate a lot of traffic, though the southern S+D would provide the fairly large town of Wimborne with a rail service. Another option would have been to keep the Salisbury route open and leave an S+D stub to Wimborne. With the Swanage route retained as well as a Bournemouth-Salisbury route, there'd probably be need for a small pool of DMUs at Bournemouth so adding in a few Wimborne turns would not be that difficult.
Romsey to Swindon.
Rationale: connectivity from the Solent area to the Swindon area is not good, with indirect routing via Reading or via Bath needed. Also, the Solent to Andover, the main intermediate settlement, is an indirect route.
Suggested service: again, if cost cutting were desired, the number of intermediate stations could be kept small, e.g. Stockbridge, Andover, Ludgershall, Marlborough.
Suggested service: hourly service from Southampton Central, calling at the above named retained stations. Perhaps some could work through to Cheltenham (but via the existing route rather than reopening the former route)
Guildford to Cranleigh.
Rationale: while the through route to Horsham is probably not needed (I'd say the same about Horsham to Shoreham as well), keeping open a stub to Cranleigh, which has a lot of housing, would have made sense.
Suggested service: EMU portion, detached off the Haslemere or Portsmouth stopping service at Guildford.
Bridport.
Rationale: area with few rail connections. Significant holiday traffic. Managed to stay open until 1975 so there must have been some demand. Big problem was that the service only ran to Maiden Newton, with that in mind it's hardly surprising it eventually closed as it made travelling anywhere to and from the branch a slow and long-winded affair.
Suggested service: run through to Weymouth, with good connections off London services. Two-hourly service (with one unit, or interworked with Yeovil line services) would probably be adequate.
Cranleigh is a reasonable sized settlement but scattered, so most people would have to get in their car and drive to the station which is what they do now to various stations so why reopen it.
Swanage traffic virtually non existent outside a few days in the summer. Ironically the heritage railway will be bringing in more economic benefit than a basic rail way.
I could go on.