My calculations assumed doubled up sets between Paddington and Plymouth, and the train splitting at Plymouth with a single set continuing to Penzance. The trains could be 5+5 or 5+6 between Paddington and Plymouth, and 5-car or 6-car between Plymouth and Penzance.
My calculations are as follows:
Paddington<->Plymouth = 4 Hours (with 1A91s diversion via Swindon and its extended journey time between Paddington and Reading)
Plymouth<->Penzance = 2 Hours
Therefore, if an average turn-around time of 60 minutes was provided for each unit at its termini, the number of sets required would equal:
(4+1)X2+(4+2+1)X2=24
There are twenty seven 222 sets and a total of 143 carriages. Therefore they can be configured into:
- 8 6-car Sets
- 19 5-car sets