Railway official resorting to steam trains (13)
I believe the answer is:
stationmaster
'railway official' is the definition.
(I've seen this before)
'resorting to steam trains' is the wordplay.
'resorting' indicates anagramming the letters.
'to'+'steam'+'trains'='tosteamtrains'
'tosteamtrains' anagrammed gives 'STATIONMASTER'.
(Other definitions for stationmaster that I've seen before include "Railway employee" , "Railway official" .)