Ya think? ;)

This trestle was originally entirely wood; then when the highway bridge was built, in the 1920s IIRC, that side was replaced with steel. Even after the railroad was abandoned and turned into the bike trail, half of the bridge remained the old wooden trestle. Then the wood part burned in a wildfire in 2000, and it hadn't been repaired in 2003 (at the time of this pic). It's since been rebuilt as all steel.

This is on the Bizz Johnson trail in northern California, a hiking/biking/horse trail that follows the old Lassen & Fernley branch of the Southern Pacific Railroad from Susanville, California, to Westwood Junction, California. It's about 26 miles long, close enough to a marathon that marathons are run along it. Here's the Bureau of Land Management writeup:
www.blm.gov/ca/st/en/fo/eaglelake/bizztrail.html