Damaged, faulty train abandoned (9)
I believe the answer is:
tarnished
'damaged' is the definition.
(to tarnish is to damage or ruin)
'faulty train abandoned' is the wordplay.
'faulty' indicates anagramming the letters.
'abandoned' becomes 'shed' (shed can mean to abandon or cast off).
'train' anagrammed gives 'tarni'.
'tarni'+'shed'='TARNISHED'
(Other definitions for tarnished that I've seen before include "Having lost lustre" , "Stained" , "Sullied" , "Dulled, discoloured" , "Blemished" .)