Crossword clues for Bus system 4 lettersAnswerClueLINEBus systemMUNICity-run, as a bus systemTHETSubway and bus system of Boston, familiarlyTHETBoston bus-and-subway system, familiarlyCARBARNBus system housing.NORFOLKOne city served by the Hampton Roads Transit bus systemMARTAAtlanta's subway and bus systemMARTAAtlanta train and bus system