If end to end was non stop, how much quicker than 16 mins would it be?
Could an hourly clockface with one being all stops and the other being fast?
Alternatively, what about WFJ-SAA 16 mins, 4 turn, SAA-WFJ 16 mins, 4 turn, WFJ-GSN 6 mins, 4 turn, GSN-WFJ 6 mins, 4 turn (all stops)...