I believe the CGW bridge is the one that has been removed, along with the entirety of the CGW trackage in the Des Moines area, not the FDDM&S structure. CNW bought all 3 predecessor railroads- FDDM&S in 1960, the CGW in 1968, and the Rock Island Spine Line in the early '80s. When they bought the Spine Line, the CGW became superfluous. It retained the FDDM&S through Des Moines as kind of a second main track to the Spine, while gradually abandoning the Great Western trackage.
I believe the CGW bridge is the one that has been removed, along with the entirety of the CGW trackage in the Des Moines area, not the FDDM&S structure. CNW bought all 3 predecessor railroads- FDDM&S in 1960, the CGW in 1968, and the Rock Island Spine Line in the early '80s. When they bought the Spine Line, the CGW became superfluous. It retained the FDDM&S through Des Moines as kind of a second main track to the Spine, while gradually abandoning the Great Western trackage.