Ringling Bros. and Barnum & Bailey N5C PORTHOLE CABOOSE #2 - O Scale. The world-famous Ringling Bros. and Barnum & Bailey Circus now travels by O gauge rail to let you experience all the excitement of The Greatest Show On Earth. Features include: navigates 0-27 curves, car length 8.5", height 3.5", durable ABS plastic shell, needle point axles, die-cast operating couplers, dual lighting.