Indeed (thanks for your reply to Nappy Thrower btw, saved me the bother). I was shocked to find out, courtesy of British Bulldog, that there can only be ONE train in either direction between Lewes and Brighton at any one time!Gwylan, I think it's something to do with the fact that there aren't enough signals. The train can't be turning around whilst the next train is on its way to Lewes. The next train would have to wait behind a signal for the whole of the period that the first train was manoevering.
The problem is is that the East Coastway line is little more than a country branch line. Fine for local needs, (non-express trains running every twenty minutes or so) but it can't be turned into the equivalent of the Metropolitan Line (or any urban railway) without massive investment. Even if that could happen before Falmer opens (which it couldn't), could it be justified when it's only really for football use?