My visit was prob circa 1973. There wasn't any guard rails back then. We just walked right out on the ties and I can distinctly remember now the trusses for the trestle bridge on our sides and above our heads and nothing else but the raging river below. We got halfway across. Times have changed. I don't think you could get away with that today, prob get electrocuted by the looks of it.
Cheers, W1