The first series (1984) used stories from the first eight books, along with one specially written by the Rev. W. Awdry, "Thomas's Christmas Party". The second series (1986) used stories from Book No.9 ("Edward the Blue Engine") to Book No.30 ("More About Thomas the Tank Engine"). The latter book was unusual, as it was written specifically by Christopher Awdry to be adapted by the show. At that time, it was a contractual obligation that the series could only adapt stories that appeared in print. The series also used a story from a Thomas Annual, "Thomas and Trevor", and a specially written stand-alone story, "Thomas and the Missing Christmas Tree". One episode ("The Missing Coach") was in the process of being filmed, but was cancelled mid-way through filming as Allcroft decided it was too confusing for young viewers. The production team went on to use "Better Late Than Never" instead. The story "Gordon Goes Foreign" from the "Railway Series" book "The Eight Famous Engines" was also planned to be adapted but was scrapped due to budgetary limitations.