Henry's Special Coal for American releases, is the eighteenth episode of the first season. In the US, this episode aired on Shining Time Station episodes Happy Accidents in 1989 and Dan's Big Race in 1993.
One morning, Henry wakes up feeling very ill. He complains about it to James, who simply shrugs it off as Henry being lazy. Sir Topham Hatt is also unhappy about this, given this is the latest in a long line of problems with Henry and not even new parts or paint seem to help. He warns the green engine that if he does not get better soon he will have to be replaced.
Later, as Henry prepares to take his first train, Sir Topham Hatt, determined to get to the bottom of Henry's problems, decides to ride along in the cab while taking off his top hat and coat. Henry manages to start, but the fireman is not pleased and notes that Henry's fire does not give enough heat. As a result, Henry quickly loses steam, and has to rest when he reaches Edward's station, leaving Edward to take care of the train. Henry's crew and Sir Topham Hatt continue to discuss what the problem is. They then discover the root of the problem; the coal provided is unsuitable for him. While the other engines have nice big fireboxes, Henry's is too small. But if Henry had Welsh coal, he would easily improve. So although it will be expensive, Sir Topham Hatt decides to send James for some Welsh coal.
When the coal arrives, the fireman carefully stokes up Henry's fire to give the best possible results. Henry initially has his doubts, but his mood changes as he comes into the platform with more than enough steam. Sir Topham Hatt is happy to see that Henry is feeling well, and warns the driver not to push him. The driver assures him not to worry: in fact, he will have to hold him back.
For the first time, Henry makes it to the junction before Thomas. When Thomas arrives, Henry calls him "lazybones" before quickly running off, paying Thomas back for insulting him before. Thomas, too surprised to be cross, reacts with disbelief and Annie and Clarabel concur to him.