Locomotion reminds us all of trains, and so it's probably related to the game somehow. However, FIRST does a great job of making these clues very vaguely attached to the game.
Example:
In 2009, the Moon fish related to the moon, which relates to Lunacy. Even if they said "MOON GAME", there is no way that we could get the Lunacy game from that.
Until we have the lurking variable, or 'lurking clue', have fun guessing
