The combined form of the previous six Railbot Micromasters is Rail Racer, a towering bot if the trains' real world scale is taken into account. Rail Racer had previously been released as Sixliner and Sixtrain in Japan, but the Rail Racer release is his American debut, exclusively at KB Toys stores in 2005.
The combined form of the Universe Micromaster Aerialbots is Superion, an amalgamation of six robots plus their pack-in accessories that serve as connectors, head, and extremities of the gestalt warrior. While in Japan, the original source of the design ( Sixwing , 1992) was available in a collected set, this combiner needed to be purchased one bot at a time in the 2007 Universe release.
