Amtrak is considering allowing people to store guns in lockboxes on most of its trains, which critics say would weaken security measures that instead should be strengthened in light of the shooting at last weekend’s White House Correspondents’ Association dinner. The company has been considering the policy change since at least early this year, after being pressured by Trump administration officials to ease restrictions on transporting weapons, two people familiar with the proposed plan told The Associated Press on condition of anonymity because they weren’t authorized to speak about it publicly. They said the railroad hasn’t abandoned the proposal despite Saturday’s arrest of a man who authorities say traveled by Amtrak from California to Washington, D.C., with his firearms intent on killing President Donald Trump and other administration officials at Saturday’s event.…