When Harvey first came to the island, the engines would say he looked different and all the engines except Thomas did not trust Harvey, but when he rescued Percy after an accident with some Troublesome Trucks, they realised that his difference was what made him special. Since then, he has proved very useful, using his crane arm for maintenance, building and clearing up. He mainly works at Brendam and the yard, but his favourite place to be is at the Water Works, where he is said to live.
Since his addition to the railway, Harvey's helped after many accidents, but he couldn't do it alone, so Rocky was brought to help.
In the seventeenth season, he helped Thomas back onto the rails after an accident. Later, Bill and Ben made fun of Harvey for being both a crane and an engine. However, Porter helped Harvey see to the positives of being a crane engine. The dock manager asked Harvey to deliver flatbeds of scrap metal to Vicarstown since Edward had been delayed, but because he wasn't paying attention when he was going down Gordon's Hill, his flatbeds derailed and made a terrible mess. Fortunately for Harvey, he was able to use his crane to clear it up and was able to deliver the cargo.
In the eighteenth season, Harvey helped Samson with the building of The Earl's new Dinosaur Park and later helped Samson with collecting track side scrap for the scrapyards while Scruff was being repaired.
In the twentieth season, Harvey helped lift Percy's brakevan back on the tracks after Thomas crashes into it when he is being pushed down the hill by the Troublesome Trucks and helped lift a fallen tree off the tracks after Skiff was able to warn Duck and Oliver about it.
Harvey is a relentlessly cheery, big-hearted, helpful crane engine. He has a very unusual shape, due to his crane attachment atop his boiler, which he can be sensitive about should other engines make fun of it. However, he is very able to show that his crane is very useful in lifting cargo, trucks, and sometimes some smaller engines.
He has a booming, thoughtful voice and large wooden buffers. He is happy to work anywhere, ready to help clear up after an accident, and offer words of care, comfort, and advice.