 An additional 60-car order is currently under construction in response to increased ridership; some cars are also planned for use on Shore Line East.The M8 is similar in design to the M7 car used on the Harlem Line and the Hudson Line.Like the M7, the M8 is able to pick up 750 Volt DC direct current power from underrunning third rail for operation along the New Haven Line from Grand Central Terminal to Pelham, where the traction power source is transferred to the overhead catenary wire.