Season
Episode
- Episode 1: Rescue at Rocky Ridge
- Episode 2: Wilson's Forest Flare
- Episode 3: Stop Koko Stop
- Episode 4: Runaway Koko
- Episode 5: Brewster Makes Tracks
- Episode 6: Chief Wilson
- Episode 7: Back Up Brewster
- Episode 8: Track Laying Brewster
- Episode 9: Explorer Koko
- Episode 10: The Old Silver Mine Line
- Episode 11: Brewster Leads The Way
- Episode 12: Park Patroller Wilson
- Episode 13: High Rise Rescue
- Episode 14: Winter Whiteout
- Episode 15: Snow Patrol
- Episode 16: Fearless Wilson
- Episode 17: Special Rescue Team
- Episode 18: Deputy Chug Patrollers
- Episode 19: Blazin' Wilson
- Episode 20: On Track Brewster
- Episode 21: We Are the Chuggineers
- Episode 22: Team Trainee
- Episode 23: Record Breaker Koko
- Episode 24: Tootington Tunnel
- Episode 25: Iron Chuggers
- Episode 26: Roundup Wilson
Chuggington Season 4 Explorer Koko
6.6/10 users Koko, Brewster and Wilson are three young, adventurous trainee "chuggers", learning about working on the railway in the town of Chuggington, with the help of the railway controller, Vee, the older engines, and their human friends.
