There were rumblings a few years ago that the Cranleigh to Guildford stretch would get re-opened, but rather like Lewes to Uckfield it doesn't look like it'll happen.
On the subject of the Downs Link, I didn't realise it went all the way to Guildford. Can you walk it as well? Obviously it can't...
Wow, yes thank you. I shall look forward to watching that as I remember the old Horsham line. (Never went on it though).
EDIT: I remember before the Shoreham by-pass was built the old wooden toll bridge used to carry the A27! You had to pay the toll at the old level crossing on the Horsham line.