There is often talk on the possible number of extra services on the SWML after Crossrail 2, however few ever make suggestions as to what that could look like. As such, rather than the traditional just add a few extra services to what currently run (i.e. an extra service to Southampton), what other services could be run which don't currently happen?
One possible could be to change the existing London to Portsmouth via Basingstoke service so that it runs fast to Farnborough and then splits to carry on as it does now and to form a new service calling at all stations to Yeovil. In doing so it would mean that an additional path for the Basingstoke stoppers wouldn't be need (or could be used to create a second service following the same pattern)
It would also provide a stooping service to Yeovil allowing the "existing" WofE services to be run faster. Although from the smaller stations west of Basingstoke it could add 15 minutes to the journey time people are likely to just get to Salisbury or Basingstoke and switch to a faster service offsetting some of that loss.
To further offset that loss (and as hinted at above) two such services could exist providing WofE stations with a minimum of 2 trains per hour and up to 4 trains per hour (for the likes of Andover, Salisbury and Yeovil). Likewise, the stations in North East Hampshire could have a minimum of 4 trains per hour (Farnborough Main & Fleet would have 5 trains per hour, unless Farnborough gained other services) as well as improving the provision to stations on the current Portsmouth (via Basingstoke) service all by just using up one additional path out of Waterloo.
In doing so that would allow more paths for other lines, whilst providing an increase of frequencies (some doubling) to a number of stations which otherwise could be seen as a lower priority.
One possible could be to change the existing London to Portsmouth via Basingstoke service so that it runs fast to Farnborough and then splits to carry on as it does now and to form a new service calling at all stations to Yeovil. In doing so it would mean that an additional path for the Basingstoke stoppers wouldn't be need (or could be used to create a second service following the same pattern)
It would also provide a stooping service to Yeovil allowing the "existing" WofE services to be run faster. Although from the smaller stations west of Basingstoke it could add 15 minutes to the journey time people are likely to just get to Salisbury or Basingstoke and switch to a faster service offsetting some of that loss.
To further offset that loss (and as hinted at above) two such services could exist providing WofE stations with a minimum of 2 trains per hour and up to 4 trains per hour (for the likes of Andover, Salisbury and Yeovil). Likewise, the stations in North East Hampshire could have a minimum of 4 trains per hour (Farnborough Main & Fleet would have 5 trains per hour, unless Farnborough gained other services) as well as improving the provision to stations on the current Portsmouth (via Basingstoke) service all by just using up one additional path out of Waterloo.
In doing so that would allow more paths for other lines, whilst providing an increase of frequencies (some doubling) to a number of stations which otherwise could be seen as a lower priority.