Rocky is a large, dark red crane with yellow hazard stripes, and is used as a rescue and maintenance unit. Gordon scoffed at the idea that Rocky could lift him, and said that cranes are useless without an engine. Edward initially shunned Rocky for this reason, and branded him "newfangled nonsense." After a careless accident, Edward came to rely on Rocky's help to clear up the mess, and took back what he'd said.
Rocky is now frequently used in recovery operations, in place of the older, olive-coloured cranes.