|This article is about the freight car. You may be looking for the engine, or another Diamond.|
Diamond is a freight car from Crystal Island.
Jasper and Diamond then caused trouble for the Sodor engines.
Diamond is vindictive, ruthless, and quick to anger. When dealing with grief, Diamond tries to suppress her negative feelings and instead wishes to move forward. She expresses this to Blue in "Remembering Pink", by explaining that she should "start looking forward and stop looking back".
Diamond is based on a 7-plank open wagon.
Diamond is painted yellow with brown lining. She has her name on her side in brown, along with her yellow gemstone. She has brown wheels.