Robot Trains - Season 1 - Eps 17: Duke Awakens
It's the day of the opening ceremony for Kay to finally open the tunnel to Area V. Everyone is in the festive mood, but Kay seems nervous because he will be put to the test as to check how much he has improved. Sensing something strange on the night of the Train Race, Jeffrey is gone to check on Duke in his jail. As everyone cheers Kay on, Duke shows up at the ceremony.
About Robot Trains

Title: Robot Trains
First Air Date: 2015-02-26
Last Air Date: 2019-05-19
Status: Ended
Rating: 5.7/10 (from 3 votes)
Language: KO
Seasons: 2
Total Episodes: 84
Network: Unknown
Genres: Animation, Kids, Action & Adventure, Comedy, Sci-Fi & Fantasy, Family
Production Companies: CJ ENM, Union Investment Partners, Woori Investment Co.
Synopsis
Set in the "Train World" where all citizens are trains. However, among the residents there are special trains that can transform into robots, the Robot Trains! Featuring our 5 train heroes, with special powers: Kay, Alf, Duck, Selly and Victor - and their exciting adventures. Can the Robot Trains save the village from the evil dark forces that be?