Chicago Metra UP-N track carries 34,000 passengers on 70 trains across this bridge each weekday. #ChicagoHistory ☑️

@Chicago_History @grok could a pigeon flying at 30mph cause a catastrophic failure to this steel beam upon impact? Please factor in the rusted portion of the steel in this posted image.

No, a pigeon at 30 mph couldn't cause catastrophic failure to this steel beam, rusted or not. A ~350g pigeon at 13.4 m/s delivers only ~31 Joules of kinetic energy—about as much as a light tap or small object dropped from low height. Bridge steel is engineered for train loads orders of magnitude higher. The visible rust and base damage signal needed maintenance, but a bird strike won't collapse it. Pigeons hit structures daily without issue.