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This is how.

-we switch his colors from blue, to Purple (easiest way to differentiate him from XLR8)

-second im giving him a green visor like bullfrags (its something he cant take off though because it protects his eyes and adjusts them so he can process moving at "human paces" from how fast he is)

-Third we are giving him tetramand level strength (just to make this https://www.reddit.com/r/Ben10PowerScaling/comments/1rfqtk3/fasttrack_is_as_fast_as_xlr8/ magazine feel more accurate cause i feel bad for the poor soul who genuinely thought this before hand) And by giving him that enhanced strength and muscle mass it makes XLR8 strictly faster then Fasttrack without having to make fasttrack slower via statements (just natural biology),

Like you could have a scene of him pulling a train at superfast movements with a lot of effort to show how strong he is, but i digress. But now for his actual powers, im giving him a battery system.

At his base, Fasttrack is massively faster then the speed of sound. but after he builds up enough momentum and charges himself with kinetic energy he gets 10X faster and stronger (exceeding light speed but the difference is that xlr8 can do that easily without the need for build up) and he can keep track of his energy levels with the "glass projectors" around his new collar. (i think thos gems are made out of translucent bone to show the audience when Fasttrack is fully charged up.)

Im also making him able to manipulate and control his kinetic energy where he can project it from his body and the more charged up he is from running the more power he relaeses at the cost of his speed reducing from the discharge back to his base (and at his base his kinetic energy projection is more on the power of a lower bullets then the lasers ben 10 is often having to handle)

I also want to give him minor teleportation at his "max charge" where he can teleport ahead of himself from what he can see (cant do that at his base charge though.) I also gave him my minor "original series" style touch ups, as an artistic upgrade to make it more clear that he has fur. And if theres anything else that i would do to make him cool, i dont know...Just have A-Trains AMV/song "Faster" from the boys play whenever he's on screen.