Restrict arguments against rail transport (9)
I believe the answer is:
constrain
'restrict' is the definition.
(constraining is a kind of restricting)
'arguments against rail transport' is the wordplay.
'arguments against' becomes 'cons' (I've seen this before).
'rail transport' becomes 'train' (I've seen this before).
'cons'+'train'='CONSTRAIN'
(Other definitions for constrain that I've seen before include "Confine, limit" , "Lock up" , "Compel; constrict" , "Force" , "Compel towards a course of action" .)