Hello Tom and welcome to the Forum. There are many very knowledgeable members on this Forum and you are sure get plenty of helpful information from them. All of the lines you mention will have train movements which are of interest to enthusiasts and, yes, that includes London Underground lines.
The only question I would raise is exactly what "derelict structures" you have in mind for your project. Please never let anyone trespass on the railway and bear in mind your own safety as well as that of all users of the railway at all times. Good luck.
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