STRANGERS ON A TRAIN: On the west coast, CBS’s San Francisco affiliate reports, “Unruly Passenger ‘WMD’ Talk Causes BART Delays.”

Back east, from Philadelphia’s CBS affiliate, Police: IED Found Near Chester, Pennsylvania Train Tracks.

And if authorities seem jittery now, that might increase in coming months: “Al Qaeda Planned to Attack U.S. Trains on 9/11 Anniversary, Bin Laden Material Shows.”