- Overload (Micromaster Railbot, 2005)
- Overload is physically identical to the 2003 Takara reissue version of San Diego, transforming into a steam locomotive of currently-undetermined model. He has a flip-down "peg" arm on his train-mode back-end that lets him link up with any of his teammates with a "socket" link-arm. He can form the back to any Micromaster "Sixteam" combined robot, but his nominal placement is as the back of Rail Racer. Sold only on an individual card, he came with the lower body to the Railbots' combined robot form.
- This mold was also used to make D-Go.
- Like all of the Railbots, he was originally a Kay-Bee stores exclusive, but later made his way to other outlets, most notably drugstores like CVS.