HO Engine GS4 4-8-4 & TenderThe streamlined, powerful SP GS4 4 8 4 steam locomotives were the choice of high speed passenger service in the Southwest until they were superseded by diesels in the late 1950s. In a choice of two distinctive Daylight color schemes plus the red, white, and blue Bicentennial model, our 4 8 4 now includes our Sound Value SoundTraxx steam package with authentic prototypical chuff, short and long whistles, bell, air pump, steam release, and blowerall in