No wonder someone on board was overheard to say "I think this train is for Portsmouth, but I'm not sure."
He wouldn't have got to Portsmouth unfortunately, the service was terminating and starting back from Southampton Central but going via Eastleigh, due to the planned engineering diversion having a landslip just south of Botley superimposed at short notice...
Just to keep the staff on their toes...
When I was at Southampton earlier the arriving trains were running empty into one of the goods loops west of the station before returning to Cardiff from platform 1 - no doubt confusing all those who weren't bothering to read the displays...
PS, just had a quick look at both 'realtime trains' and 'opentraintimes', and neither reflect what is actually happening in reality. National Rail's live departure boards seem reasonably correct though...
Paul