Robot Trains - Season 1 - Eps 4: Runaway Virus Train
As the power of the Train World becomes weaker, viruses spring up and begin to infect the inhabitants. If infected, the trains lose control of their engines and run until they completely exhaust their energy. While Selly searches for the vaccine, Kay and Duck enter the infected zone, Area D. The virus has already spread throughout the region, putting trains in danger.
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?