Hello, Hepworth—and welcome to English Forums. Thank you for registering as a member. The subject is implied?
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Hepworth101AA..The subject is implied?No; the subject is 'train'.
Hepworth101AB 'When' is a preposition of time?No, it is not a preposition at all; it is an adverb.
Hepworth101A1 How do you know 'when' is an adverb and not a preposition?Because 'when' is never a preposition. Check all the dictionaries you like: http://www.onelook.com/?w=when&ls=a
Hepworth101A2 What is the