Every TransFormers team needs a leader, and for Team Bullet Train, that's Railspike. This role also makes him the uppermost section of the Rail Racer gestalt and, considering how Midnight Express handled being the legs, one would have to become concerned about how so similar a cylindrical vehicle could handle being both an individual robot and the upper chest, arms and head of a combiner.
It's probably not a good sign that neither Hasbro nor Takara Tomy ever repainted this mold, or used the same template with alternate vehicles... But let's see how Railspike works out on his own merits...