(...) You are right: there are "only" 19 full sections on the bridge, but of course there are two times 50% of a section too (easily to see on the left and since the bridge is symmetric it has to be on the right too). (URL) 20 in total and still 640 (...) (23 years ago, 5-Dec-01, to lugnet.trains)
(...) To the *centre* of the footings, yes. But not *between* the footings. I'm not actually sure where the span of various bridges is measured, but I thought in such a bridge it would be the distance between nearest extremities of the footings. (...) (23 years ago, 8-Dec-01, to lugnet.trains)
