Railcar put in motion — not at all like The General (10)
I believe the answer is:
particular
'not at all like the general' is the definition.
(particular is the opposite of general)
'railcar put in motion' is the wordplay.
'in motion' is an anagram indicator (I've seen this in other clues).
'railcar'+'put'='railcarput'
'railcarput' with letters rearranged gives 'PARTICULAR'.
(Other definitions for particular that I've seen before include "Fog over London" , "Respect" , "Special" , "item" , "Nice" .)