QSI(R) sound and DCC operates on both DCC and DC, features variable rpm engine, horn, bell, squealing brakes, doppler effect, air let off (in neutral), headlight and trailer, which mutes whistle and bell for double-heading * Heavy die cast chassis for maximum traction * Precisely meshed gears for silent running machined brass flywheels * More than 60 factory-applied detail parts * Led constant and directional headlights