Down services in my copy of the January-April 1902 timetable:
5:30am departure calling at Reading, Swindon, Bath, Bristol, Exeter, Torquay, Plymouth, Falmouth and Penzance, arriving 4:58pm. Journey time ~11 1/2 hours.
Penzance Corridor Express Departing 10:40am, calling at Bristol, Exeter, Torquay, Plymouth, Falmouth and Penzance, arriving at 7:10pm. Journey time 8 1/2 hours.
Plymouth & Penzance Corridor Express Departing 11:45am, calling at Swindon, Bath, Bristol, Exeter, Torquay, Plymouth, Falmouth and Penzance, arriving at 9:23pm. Journey time ~9 1/2 hours.
West of England Corridor Train Departing 10:00pm, calling at Reading, Didcot, Swindon, Chippenham, Bath, Bristol, Exeter, Torquay, Plymouth, Falmouth and Penzance, arriving at 07:30am. Journey time: 9 1/2 hours.
Sleeper Train Departing midnight, calling at Windsor, Swindon, Chippenham (1st set down only), Bath, Bristol, Exeter, Torquay, Plymouth, Falmouth and Penzance, arriving at 11:02am. Journey time: ~ 11 hours.