What should you do if, god forbid, someone pushes you off the subway platform into the path of an oncoming train and you can't pull yourself back up, as in the tragic case of Ki Suk Han?
Should you lie down in the track bed, like Wesley Autrey did? Should you run away from the oncoming train, in the hope of outpacing it?
"Due to the varying lay-outs of stations and roadbed construction there can be no single policy for a person finding themselves on the tracks," said M.T.A. spokesman Kevin Ortiz, in an email.