Sixtrain is a retool of the Return of Convoy combiner Sixliner, made up of six train Micromasters that combine via attaching to robot-mode kibble. When separated, this kibble becomes three different weapons; the legs can mount on San D-Go or Atlan's vehicle modes as a large roof-mounted cannon/thruster, the torso can connect to either footplate to form a twin blaster car pulled by any member of the team, and the gun, fists, and head all combine with the other footplate to form a weapons trailer.
Released in 1992 as part of Takara's Operation Combination Generation 1 sub-line, these figures were only available in Japan, and never released in the United States. They were later reissued in Japan in 2003 with slight color changes, and also had their stickers replaced with paint applications. You can see a comparison between the originals and reissues on Brr-icy's blog located HERE.
The figures come complete with all parts to form Sixtrain, could use a bit of cleaning but are in good shape for their age. There is slight sticker wear from age, but nothing that will detract from their vintage awesomeness!