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— Koko's catchphrase

Koko is a green and white electric engine. She is an advanced trainee and one of the main characters of Chuggington. She is also the lead singer of the "Rock 'n' Rollers" - a band she formed with fellow trainees Wilson and Brewster.


During her first delivery outside of the Depot, a power cut occurred, causing Koko (an electric engine) to become stranded in the countryside. Wilson and Brewster, who were not far behind, noticed this; Wilson took her back to the Depot while Brewster finished the night shift to Tootington himself. Soon after, Koko would become the winner of the annual Chugger Championship.

Koko would eventually go on to join the Speed Fleet with Hanzo; also receiving her own passenger service. Koko also received a removable speed booster- of which, while efficient, was the culprit of numerous incidents, such as nearly colliding with Brewster and becoming a runaway.

After many years of defending her title as the winner, Brewster and Wilson would eventually win the Rip Roaring Relay Race; even so, Koko would still keep Zephie (who is not the fastest or strongest chugger for sure) as her partner indefinitely, after being very impressed by her keeping up with Brewster for the entire race. Around this time, Koko along with Wilson and Brewster would form the band, the "Rockin' Rollers"; unfortunately however, on the morning of their first performance, Koko's horn broke. Despite many struggles, the three trainees were able to still make use of Koko's broken horn during their first performance.


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.

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. Despite her faults, Koko is still a chugger that you can count on, and she is proud to call Wilson and Brewster her friends.

Technical Details


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. In the Season 2 premiere, Koko's New Look, Zephie painted her, out of anger, to look like a pirate. Unfortunately, it was permanent. So Koko had to be re-painted. As of season 4, she has optional built in speed boosters while working as part of the speed fleet. In Glow Koko, she was temporarily painted in a glow in the dark green livery.




Koko would have also played a role in the cancelled special, High Speed Action.

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Audio Files


First used Last used Sound Effect
Can't Catch Koko Active

In the Chuggington Interactive Railway toy line, Koko is incorrectly depicted with Irving's horn.

First used Last used Sound Effect
Chuggington Interactive Railway Chuggington Interactive Railway
First used Last used Sound Effect
Honk Yourself Awake Honk Yourself Awake


  • Koko is the oldest of the trainees, although the real 0 Series was not built until 1964, which would make Koko much younger than Brewster and Wilson.
  • She is the only fully electric powered trainee.
  • Some of her catchphrases include "Betcha' can't catch Koko!" and "Go Koko, go Koko!"
    • In Polish, Koko's catchphrase is "Raz & dwa i tut tut!" (One & two and toot, toot!).
  • In German, she says "Toot, Toot!" instead of "Choo, Choo!"
  • Koko is the first trainee ever to win the speed badge.
  • As stated in the episode The Record Breakers, Koko holds the record for the fastest speed going up-hill.
  • Koko has a front coupler inside of her plow, unlike her basis which had a front coupler inside of its nose.
  • Koko has the most iterations and variants out of any StackTrack model with a total of seventeen.


"Bet you can't catch Koko!"
— One of Koko's catchphrases
"Chugga chugga choo choo! Fastest chugger coming through!"
— Another one of Koko's catchphrases
"I just love crushing up rocks!"
"Just don't spill any on the tracks, "Ballast Brewster". I don't want to be slowed down by anything today!"
"I won't…"
— Koko and Brewster, Runaway Koko