Hi Charlotte
I don't want to be discouraging but, even if you did find a length of "disused" line, it still belongs to someone - probably Network Rail, an operator or a private company. Filming on it without permission would certainly be trespassing. You might get permission (eventually) to film but I bet it would be much harder and more time-consuming than approaching a preserved railway. They will welcome you but yes, quite reasonably, they will make a charge.
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