At the close of the 1930s, American railroads were steaming forward with a wave of improvements to the passenger experience. Lightweight coaches, streamlined designs, and new forms of locomotive propulsion were fast revolutionizing the industry. In some cases, legacy steam locomotives were also upgraded to meet these new design standards. Between 1940 and 1941, four Pennsylvania Railroad K4 Pacifics received modern streamlined shrouding developed by acclaimed Art Deco designer, Raymond Loewy. The locomotives would spend almost a decade wearing this striking appearance as they traversed the PRR system in express passenger service. The Bachmann Streamlined PRR K4 comes equipped with Econami™ Sound Value DCC, featuring the Soundtraxx® steam package, a die-cast boiler, and a precision motor. Factory set for realism, the Soundtraxx® steam package offers a choice of 16 whistles, 6 bell types, 4 prototypical chuffs, 5 air pumps, and 5 dynamos, plus cylinder cocks, grade crossing quill, blowdown, brake squeal/release, coupling/uncoupling, water stop, and “all aboard” announcements with coach door operation effects - all in 16-bit polyphonic sound.