An elegant steel span 1903-vintage Southern Pacific Railroad bridge over the Cienega Wash was so badly damaged after a derailed freight crashed into it that Sundt construction crews demolished and replaced it in 1968. What’s pictured is the bridge after its supports were dynamited. See more photos at tucson.com/retrotucson

Dan Tortorell / Tucson Citizen 1968

An elegant steel span 1903-vintage Southern Pacific Railroad bridge over the Cienega Wash was so badly damaged after a derailed freight crashed into it, that Sundt construction crews demolished and replaced the bridge in 1968. It took 680 pounds of explosives to bring it down. See more photos at tucson.com/retrotucson