Ron's photo above is what I've heard referred to as a "ballasted deck bridge". Don't know why those were done that way, but I've seen one out here in California on the old ATSF Lake Elsinore branch. If you set up a wood trestle with side beams and boards across the stringers, FasTrack placed on top of that (within the side beams, of course) would look like a ballasted deck bridge. The one still standing on the Lake Elsinore branch was about 40' long spanning a wash.
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