Eighteen inches is enough to hold the Port of Baltimore back from record-setting revenues. Even when the wreckage of the Francis Scott Key Bridge is finally cleared and port activity gets back on track, the Howard Street Tunnel, a 1.7-mile section of CSX Transportation’s rail operation that cuts under downtown Baltimore, will still be a foot-and-a-half shy of being able to handle the freight fad of the future — double-stacked cargo trains.
