This audiobook was originally meant to be released in July 2010, but was pushed back to 2011 (a year later), possibly due to a re-release of volumes one, two, and three in a slipcase boxset. However, some online shops such as HMV had the CD available for purchase, stating that it was released in June 2010. However, Amazon.co.uk had the CD marked for a June 2011 release and the official BBC shop didn't relist the item.
This was the last Railway Stories CD to be released due to the series being discontinued.
In Bluebells of England, when Percy and Douglas whistle, Edward's whistle sound is used at different pitches, whilst Stepney uses Henry's whistle sound. In Bowled Out, Stepney's whistle is changed to Duck's.