My own programme is as below, but you can take a photo in Cornwall at any of the bigger stations that are served by both the 08.44 and 09.40 from Penzance (sadly not Lostwithiel or any stations between Liskeard and Plymouth), also you could go to any station on the South Devon main line between Plymouth and Exeter, subject to changing at Newton Abbot for the intermediate stations to Exeter; apart from Ivybridge.
Monday 8 September
Penryn d. 09.04 (Penzance d.08.44) Truro 09.18/09.26
Par a.09.51
5029 and 34046 due to pass Par at 10.01
Par d 10.42
Plymouth a. 11.39
5029 and 34046 in Plymouth station 11.01 – 12.31
Plymouth d. 11.50
Newton Abbot 12.26/ 12.31
Dawlish a. 12.43
5029 and 34046 due to pass Dawlish about 13.30
Dawlish d. 13.53
Exeter St Davids a. 14.16 or Exeter Central a.14.21
34067, with steam banker, due off Exeter St Davids towards Central at 14.37
As the next train east from Exeter is at 15.25 (due to overtake Tangmere at 16.51 at Gillingham during a water stop), further chasing is otherwise impracticable and there are of course a variety of trains home!
Monday 8 September
Penryn d. 09.04 (Penzance d.08.44) Truro 09.18/09.26
Par a.09.51
5029 and 34046 due to pass Par at 10.01
Par d 10.42
Plymouth a. 11.39
5029 and 34046 in Plymouth station 11.01 – 12.31
Plymouth d. 11.50
Newton Abbot 12.26/ 12.31
Dawlish a. 12.43
5029 and 34046 due to pass Dawlish about 13.30
Dawlish d. 13.53
Exeter St Davids a. 14.16 or Exeter Central a.14.21
34067, with steam banker, due off Exeter St Davids towards Central at 14.37
As the next train east from Exeter is at 15.25 (due to overtake Tangmere at 16.51 at Gillingham during a water stop), further chasing is otherwise impracticable and there are of course a variety of trains home!