Keep something hideous, pornographic magazines perhaps for online literary creation? (8,7)

'online literary creation?' is the definition.
(train in the Harry Potter books - on a train line)

'keep something hideous pornographic magazines perhaps' is the wordplay.
'keep' becomes 'hog'.
'something hideous' becomes 'wart' (wart can mean an unpleasant feature).
'pornographic' becomes 'sex' (sexually explicit).
'magazines perhaps' becomes 'press' (magazines are part of the press).
'hog'+'wart'+'sex'+'press'='HOGWARTS EXPRESS'

'for' is the link.