Er.. did you actually read the previous few posts?
The service you ask about was due to start from Dec 2010 as planned in the new franchise - therefore I just confirmed a few posts ago that it is in the journey planner and is about to start...
The Soton-Brighton sunday services are
definitely happening! It was a franchise commitment!
The sunday diagram (or at least a recent draft of it) crossed my desk a couple of weeks ago and it looks pretty good. I dont have it to hand at the moment, but from memory the first departure from Soton Central is at 0735ish (reasonably early for a sunday) and the service is hourly to Brighton until 2030ish, with two departures thereafter to Barnham/ Littlehampton. Last train is circa 2230ish, if my memory serves me correctly. Obviously coming from memory and the diagrams might still get tweaked a bit!
It is a little disappointing that the weekday/ saturday Brighton service will not be running via Southampton Airport (this was also a franchise commitment), but the six extra XC services to Southampton Central will arguably be of greater benefit, although I have concerns about their reliability, given the congestion in the Southampton area as it is!
There has been some very impressive patronage growth at stations in the Solent area over the last few years- was looking at this in detail a couple of weeks ago, and pax figures at Swanwick have increased from circa 300,000ish per annum to in excess of 500,000 pax per annum over the last 5 years. The extra Southern service from 2007 has surely helped. Pax numbers at Cosham have also been storming upwards of late, following a dip (as seen in all Portsmouth area stations) during the resignalling work in that area.
50+ % increases in patronage over the same period have been observed at some of the other stations in the area, and in general the Solent line and other South Hampshire stations are displaying impressive patronage growth, such that peak train loadings are very good. The 0852 arrival at Soton Central from Brighton verges on having pax in excess of capacity (3 car 377) and other arrivals into Soton from the east between 8 and 9 am are well-loaded. Patronage is also good going the other way (ie towards Fareham & Portsmouth) in the AM peak.
With the improved sunday service, I'm sure these increases will continue unabated, despite Southern's reliability not being all that great!
As far as 313s go, my understanding was that the original plan was for just one very early morning (prior to 7am) Southampton- Brighton weekday departure to be operated by a 313, but a bit of re-diagramming has apparently led to this being changed to a 377. Which means the lines west of the Portsmouth Triangle should normally be a 313-free zone- although I havent asked about the weekend plans.
Apparently about 1/3 of SN departures out of Portsmouth will be 313-operated.