Unloading Trestle track

[nachoman]

How are those rails actually fastened to that trestle? Clips, bolts, or both?

From the photos, it looks like the bolt is a "clip". I think the bolt heads you see on the side of the rail are the ends of the "clips" you see - you just can't see both sides at the same time. I think the bolt has kind of a hook on the end used to clamp to the bridge, and they alternate sides.