K4S is a locomotive designed in Xhystos. It won the Grand Invention Prize at the First Inter-City Exhibits 1). This K4S looks a lot like the designs that Raymond Loewy made in 1937 for the Pennsylvania Railroad. He designed a streamlined shroud for K4s Pacific #3768 to haul the newly redesigned 1938 Broadway Limited. He followed by styling the experimental S1 locomotive, as well as the T1 class. In 1940, he designed a simplified version of the streamlined shroud for another four K4s. In 1942, he designed the streamlined shroud for the experimental duplex engine Q1 which was his last work of streamlining PRR's steam engine.