It meant drivers should be smart about their motoring. Their popular bumper sticker read “Drive Now, Talk Later.”They meant talking on cellphones, of course. Years after Amtrak and other commuter rail systems adopted “quiet cars,” Metro-North finally agreed to give it a try in 2011. If we used to have smoking and non-smoking cars, why can’t we have “quiet cars” as well? If a longer call is necessary, get out of your seat and talk in the vestibule.