Interesting thread. Until now, I never realised how many of my railway memories are wrapped up in smells!
Not peculiar to NSE. In the north-west, Hindley station has a moderately long, enclosed passageway from the street to access the ticket office & platforms. This always had a characteristic smell of wooden floorboards, plus some other unidentifiable "station" odour. Not nasty, just somehow unique.
When Wigan North Western was totally rebuilt in the early 70s, the new entrance & ticket office had black rubber floor tiles installed. This always had a distinct industrial rubber smell, which I thought was very progressive, clean and modern at the time (at least compared to the run-down, decrepit nature of much of the BR infrastructure in that era).
Regarding other smells:
Surprising no-one recalling the old-school railways has mentioned tobacco smoke, from the days of smoking and non-smoking carriages.
Having said that, I don't remember ever getting in a train and being overwhelmed by the stink of cigarettes in the carriage. Whereas I definitely do remember this regularly on the top deck of buses.