Journey in trains running on time (7)
I believe the answer is:
transit
'journey' is the definition.
(I know that transit is a type of journey)
'trains running on time' is the wordplay.
'running' indicates an anagram (the letters run around to different places).
'on' means one lot of letters go next to another.
'time' becomes 't' (abbreviation).
'trains' anagrammed gives 'transi'.
'transi'+'t'='TRANSIT'
'in' is the link.
(Other definitions for transit that I've seen before include "The process of going or passing - sic . . . . . . . gloria mundi" , "Movement from place to place" , "Conveyance of goods or people - tin star (anag)" , "Pass across/through" , "In migration" .)