Union representatives and safety consultants say the case of the man charged with attempting to assassinate President Donald Trump at a media dinner is the latest example of someone allegedly trying to use the country's passenger trains to smuggle guns for an attack.

The Transportation Department is going to train 163 track inspectors to dramatically increase the number of people who know how to spot critical problems with railroad bridges, but the railroads themselves will still be responsible for inspecting their own bridges and the results will still be kept confidential.