The trestle is in remarkably good shape for a 70 year-old.  Footing on top of the trestle is solid.  There are walkways constructed from heavy galvanized steel grates supported by cantilevered beams on both sides of the track.  There are a few uneven spots in the grating so one always has to be mindful of where one is walking.  Traversing the top of the trestle is not for acrophobias, however, since there is a clear view all the way to the canyon floor some 200ft below as you walk it's length.