On the Hounslow Loop, the last London-bound train on a Sunday is later. At Hounslow it is at 2335, whereas Monday-Saturday it is at 2316.
If we include that then there is the Waterloo to Portsmouth service at 0.50 Monday morning. Every other night of the week last service is 23.45. If I'm going to a concert at the O2 and I am travelling back on the Portsmouth line, I will choose a Sunday night gig date over a Saturday night or Friday night one.
It's one of the few times where I prefer to go out on a Sunday night than say a Friday or Saturday.
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Not sure this counts but brighton gets double the frequency of limited stop gwr trains from bristol etc including a sunday only working that begins from romsey (or used to!) and a late night service that used to be ecs from brighton to portsmouth harbour
Southern also provides a better coastway west service on sunday with the victoria trains routed via hove from chichester calling only worthing shoreham hove
There is a better service from Haywards Heath to Chichester and Portsmouth on a Sunday. One an hour. During the week nothing. Takes about 1 hour 30 minutes on Sundays and 1 hour 45 to 2 hours during the week.
The government once talked about electrification saving 20 minutes from London to Cardiff. We'll you could save that to Portsmouth from Haywards Heath if you travel on a Sunday, engineering works notwithstanding. This Sunday you looking at about 2 hours 30 - 45 minutes with some of that thrown in.
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