Bill And Ben

BILL AND BEN are a pair of twin engines who work in the Sodor Clay Pits, and are known for their mischievous pranks.

Appearance
Bill and Ben are yellow Bagnall 0-4-0ST Tank Engines with nameplates and the letters "SCC" which stands for "Sodor China & Clay".

Personality
Bill and Ben are both pranksters, and use their identical looks to play pranks on other engines. Some of their pranks end up getting them in trouble.

History
Bill and Ben came to Sodor in Twin Trouble, where they were sent to work with Timothy in the Sodor Clay Pits. They played pranks on almost every engine.

They played a prank on Diesel as revenge for him bullying the twins.

Trivia

 * Bill is slightly older.