X family

"The X family is a group of robot trains led by Train X. It consists of Duke, Moss, and Dos. They have a goal to steal energy balls and glorify Train X. Their phrase is: 'To free Rail World from worry' - Moss 'To bring Master X's glory' - Dos 'Here we come' - Duke. 'Brainy Moss!' - Moss 'Handy Dos!' - Dos 'Speedy Duke!' - Duke 'The invincible X Family!' - all."