Bill & Ben

Bill & Ben are two tank engine twins owned by the Fat Controller and work on the North Western Railway. They work primarily at the China Clay Quarry.

Bio
Bill & Ben made Boco dizzy and crashed Murdoch twice.

Personality
They feel guilty for causing Murdoch's death and they're troublemakers.

Appearances

 * How Diesel 10 Stole Christmas
 * Murdoch the Quarry Engine