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“You are thinking too much. You need to trust yourself to do the right thing."
"I know, but it's not easy!"
"This is true. But once you've learnt it, you will never forget it.”
―Hanzo and Koko

Stop Koko Stop! is the third episode of the fourth season.


At the Chug-a-Sonic Speed Track, Hanzo teaches Koko to brake at high speed. First, she must turn off her boosters, then brake using the back wheels, then brake using the front wheels. The Chuggineers are building tracks and while Brewster brushes them, he discovers a sun kink, which could derail a chugger if ran over. Brewster alerts Jackman at Chug Patrol and he closes the track while the Chuggineers repair it.

Koko is having problems braking smoothly. Sometimes she brakes in the wrong order, sometimes she forgets to turn off her boosters. Hanzo gives her some Chug-bots so she knows when she isn't braking smoothly. Hanzo decides to try again tomorrow.

The Chuggineers are about to start fixing the sun kink when Brewster sees Koko travelling at high speed. Brewsters Shouts Koko but Koko realizes that she won't stop on time. She turns off her boosters, brakes using her back wheels, then finally with her front wheels. She now has the hang of braking at high speed.


Rolling Stock[]







  • Because of the use of stock footage from Rescue at Rocky Ridge, the rear bogie wheels to Hanzo's coach are missing in the shots of him racing down and back the Speed Track spiral. Additionally, because the stock footage from Brewster Makes Tracks is mirrored, a few of Brewster's details, Pond Station and the scenery surrounding Longlow Tunnel are on the wrong side.
  • When Brewster returns to the other Chuggineers, Fletch is briefly shown with the old Magnet Car. In the next shot of him, it's been changed to the Chuggineer Magnet Car.
  • In the UK credits, Carina Reeves goes uncredited for voicing Tyne, and in the US credits, Dai Tabuchi goes uncredited for voicing Hanzo.