The original post mentions Portsmouth & Southsea, to my way of thinking that is one route. The line to Portsmouth Harbour could be classed as a separate entity. In the same way that Manchester Piccadilly has twelve terminal platforms and the junction which carries on towards Oxford Road and beyond. In both cases the two routes are connected, but in effect are separate. Rock Ferry has also been mentioned. That too has terminal platforms, from the old electrified line from Liverpool and the steam route from Birkenhead Riverside Station.
Most other places mentioned seem to be stations with bay platforms, of which there are many, although Reading, with its third rail platfoms probably falls in line with Portsmouth and Piccadilly.