I've seen the trolley sporadically on the PDL, generally on weekday afternoons IIRC. I once saw someone being trained as a trolley assistant, so four if you're lucky![]()
On the Portsmouth Direct there are 27 up and 28 down weekday services that are advertised as having "catering" which is trolley service only. In off peak these are on the 2per hour "fasts", if an average of 100 minutes for 74 m 30 ch could be described as fast, I refer to them as limited stop!