I've only just come across this, but I'm wondering whether it really is a railway bridge, and whether it is even in Sussex. This is why:
Don't most bridges over railways have a more or less level deck rather than such a pronounced arch? This looks to me more like a somewhat older river bridge. The other things that might suggest a railway (white fencing, notice) are by no means exclusive to railways. And without knowing the date, it's impossible to say whether the number of telegraph wires relates to an earlier railway connection, or to general usage at a later date, with the wires running alongside the main road on the other side of the bridge.
As for location (incidentally, I agree with the thoughts on compass alignment), I'm not Sussex born or bred, but I did once live in the Weald area for about 6-7 years, and the general style of the buildings and walls don't really ring a bell. The use of stone rather than brick, and small/low whitewashed cottages to me are far more reminiscent of other parts of the country.
Lastly, the gates on the left, and associated wall and fence, look to me like the entrance to a churchyard (or chapel etc).
I'm afraid I don't have any definite suggestions as to location, but I'll think a bit more...