Koko

Unlike Wilson and Brewster, Koko is completely electric and uses her own power directly from the tracks beneath her. She loves to race others, knowing full well that they don't stand much of a chance against her. Despite having such pride in her speed, Koko still cares about her friends and never takes them for granted. While she often teased Wilson and especially Brewster in the initial seasons, she has grown to really appreciate them and, as of the sixth season, eventually even took up a peacemaker role in the trio.[4]

Even so, Koko still has a lot to learn. In addition to being overly competitive, she is also very adventurous and sometimes lets her curiosity get the best of her, causing problems for both herself and other chuggers. She also sometimes feels that getting revenge is her best option; most notably when she painted Zephie's face with spiders out of anger for her.[10] Despite her faults, Koko is still a chugger that you can count on, and she is proud to call Wilson and Brewster her friends.

Appearance: Koko is loosely based on the 0/200 Series Shinkansen, a Japanese bullet train. Koko has a large light on her front, which resembles a nose. The real 0/200 series does not have this feature. instead, they have two smaller lights to either side of what would be the "nose" on Koko. Also the real 0/200 Series doesn't have an upturned nose, a large front bumper, or a set of three horns on top of their cabs. Unlike Koko, while she pulls her Speed Fleet passenger cars, the real 0/200 Series doesn't have flush rocket boosters on either side; this is where the large vents would be (originally they were a set of windows, which is where passengers would reside in). It is likely that she was modified into a more freelance design. Koko is painted green and white on her body with purple lining and underbody.

at a station in Chugginton.