Chuggington: Runaway Koko

SINOPSIS

Koko's speed booster malfunctions and she speeds around Chuggington out of control. Chug Patrol get ready to rescue her with some strong nets, but even they can't stop Koko. Brewster has been crushing rocks and saves the day by dropping dust onto Koko, which clogs up her booster and finally brings her to a standstill.