Transtrain is Xaxon's Trocyberian (a species from the planet Automanus) form. He appears as a silverish robot. He has two blue, pupil-less eyes. His legs are thick, have a few exposed gears, and have large external kneecaps. His arms are equally thick. He is remarkably human-like, but is, of course, robotic. His "skin" has a pattern which resembles overalls. His human-like head has two cylinders (like minature versions of the ones on Transylian backs) protruding from the back. He has a square, under-bitten jaw connected to two small discs on either side of his head which allow the jaw to move up and down. He has no nose. There are lines across his body which suggest that he can fold up (he can). His body shape is overall blocky. His Protomnitrix Symbol is on the center of his forehead.
As a Trocyberian, Transtrain can transform into any kind of technology (no matter the size or shape) and turn his right arm into a weapon (in his case, an energy axe).
- Transtrain is based heavily on a robotic alien seen in Ben 10: Secret of the Omnitrix in the scene where a hooded Myaxx is visible, along with an alien holding a Rubik's Cube.
- Transtrain is basically all of the Transformers rolled into one.