Train driver's plan (8)
I believe the answer is:
engineer
I believe this is a double definition.
'train driver's' is the first definition.
(I've seen this before)
'plan' is the second definition.
(I know this)
(Other definitions for engineer that I've seen before include "Machine designer, maker or operator" , "Professional who may be civic, electrical or mechanical" , "One who designs/builds" , "Practical technologist" , "Mechanic" .)