Motor and railway transport (5)
I believe the answer is:
carry
'transport' is the definition.
('carry' can be a synonym of 'transport')
'motor and railway' is the wordplay.
'motor' becomes 'car' (I've seen this before).
'and' says to put letters next to each other.
'railway' becomes 'ry' (abbreviation for railway).
'car'+'ry'='CARRY'
(Other definitions for carry that I've seen before include "range" , "(Of sound) be audible at a distance" , "Stock" , "Move" , "Have on one's person" .)