If anyone's not yet had a go, they may wish to go and have a look at the discussion before they look at the answer.
After I'd dissuaded people from choosing "Glasgow", a curiously large number of people chose "station". There were two people who chose "buffers", one "railway", one "Edinbro", one "capital", one "platform", one "instant". And a few other guesses. Alas, none of these are correct.
andrewducker got impossibly close, when he commented saying I noticed that starting-point is an anagram of train-spotting -- and then went ahead with an incorrect guess.
and so, of the 14 people who guessed so far, only darth_tigger got it right.
"Starting-point for train-spotting" -- "anagram".
Thanks to all of you who took part.