Mine probably the oldest recollection.
Bristol to Taunton, coming home, 1960s. There was a 1700 (5pm in old money) which had come through from Manchester via Hereford, in the 50 minutes to Taunton there was nice time to board at the restaurant car where afternoon tea was served. My mother enjoyed all this as much as me. Toasted tea cakes, the small pots of jam, which at the time were unique to the railway, big pieces of fruit cake, etc. Sometimes there was disorganisation, and the Bradford to Plymouth "Devonian" (the "Devvy" at Taunton), due out at about 1620, might still be around by 1700, and there was a choice of which was first to go; on an odd occasion the two Warships raced along a block apart.
Both had restaurant crews who had been up all day, having done lunch, and at least once the tea menu was supplemented by left-over puddings from the lunch service, offered via one's mother in a somewhat lowered, almost conspiratorial voice by the chief steward! All best appreciated in late autumn, dark by this time, trees bare, maybe even snow on the ground (we used to have loads then). It's an easy route for the loco crew, controller right round at Bristol TM, leave it there. 75mph by Weston, over 80 by Bridgwater, smash over the diamond crossing of the Athelney branch at Durston, forever the roughest moment in the trip, few minutes gained to Taunton. Was that one of the stewards nipping up the platform there to the Warship with a couple of old BR mugs of tea?