Thunderbirds Are Go! S01E07 - Runaway

A high-speed test train on a Japanese Maglev line suddenly goes out of control and is in danger of running into the back of a passenger train. Only Brains can stop it, so he sets out with Scott on Thunderbird 1 to board the train. But in doing so, he discovers the train is under the control of an Artificial Intelligence program, which John determines is playing a game. Scott and Brains must find a way of stopping it before it crashes into a station terminal.