Breaking the glass is the first episode of Season 3!
Plot
When the big station becomes packed with passengers, James wonders what's going off until he see's Diesel with a crane and some workman replacing the glass on one of the canopies. Diesel said that he suitable for the job as he doesn't shot steam onto the broken glass which James thought it was silly and said that a steam engine can handle a job like that.
He would later be chosen on the job but when Gordon teased him he got puffed up and shot up and the broken glass fell and smashed onto James, luckily on one was hurt and the mess was soon cleared up, but when James got back to the sheds the others teased him and said he should try not to break the glass in future!