ConnDOT plans call for Kawasaki M8 multiple units to eventually operate most SLE service. ConnDOT has proposed to use up to 32 M8's in SLE service as far as Old Saybrook; the step-fitted diesel equipment will then be used on the Hartford Line and for New London / Mystic / Westerly service. Limited direct service from Grand Central Terminal to may be added once the M8s are in service. Testing of M8 cars on the Shore Line East route began in February 2017.