Prototypes for this Broadway Limited N Scale Paragon4 Class M1a 4-8-2 Mountain were considered by fans the pinnacle of Pennsylvania Railroad steam locomotives. This N Scale model is equipped with the Paragon4 sound system which works with all Broadway Limited Rolling Thunder(TM) advanced sound systems. Other features of this locomotive include a heavy die cast chassis, smooth-running flywheel-equipped drive, directional lighting and magnetic knuckle couplers. It can be operated on all DCC systems as well as on standard DC railroads (with limited sound functionality). The decoder is mounted in a Next18 socket. It has wheels profiled to operate on Code 55 and larger rail and curves of 9-3/4" radius and larger are recommended.