On what is known as Chain Bridge in March, Cambridgeshire and part of the planned Wisbech & March Bramley Line, there are sleepers between the rails and across the iron bridge. If you care to go to www.freewebs.com/bramleylinesupporters and then their photo album, there is a photo of this same bridge and showing sleepers across it. I know for a fact they are there because I photographed them before and after my mate, a fellow member of the Track Clearing Team, cut a tree down that was growing in between. Whatever your decision, I hope it works out for you.