The Trouble with Mud is the 62nd episode of Thomas And Friends
One morning, Thomas is being cleaned when a muddy Gordon arrives. Thomas tells Gordon to have a wash down, but Gordon does not care and leaves. A strong wind is blowing and Gordon's driver tells him to slow down, but that only makes Gordon more cross at being dirty and late. In the goods yard of the next station, Gordon sees a sign saying "All trains must wash down daily."
James is just finishing with his wash down and Gordon's driver tells him it is his turn now, but Gordon angrily lets off steam and mud flies all over his driver, the workmen, and even James. Gordon's driver scolds him that he is a very naughty engine and now he has to wait until James gets another wash, but Gordon does not and leaves to pull the express. The Fat Controller is waiting for Gordon at Knapford and tells him that, because he is muddy, Henry will have to pull the train instead. Gordon is then ordered to get cleaned up at once.
Gordon leaves to get a wash down and then shunts trucks for the rest of the day. Soon it is James' turn to take the express, Gordon warns him about the hills being slippery and says that he may need help, but James denies this and leaves. Earlier, a storm swept across Gordon's Hill, blowing leaves onto the tracks. Though the storm is over, the hill is still slippery.
When James sees the signal that the line is clear, he picks up speed as he tries to pull the train over the hill by himself like before. But halfway up, his wheels begin to slip and instead he rolls back down the hill. Gordon sees everything and decides to help James up the hill. Then, thanks to Gordon’s pushing from behind, James makes it to the top.
That night, Thomas asks the Fat Controller if Gordon can pull coaches again. The Fat Controller says that Gordon may, as long as he understands the importance of having a good washdown. After he leaves, the other engines went to sleep. Gordon states that "Dirty or clean, he's a famous machine," even though there is no one else left awake or around to hear him.