Arthur's Branch Line was introduced in the fifth season as the Fishing Village Line. When the branch line opened, the Fat Controller first put Thomas in charge, but when Thomas had an accident, Arthur was able to ask the Fat Controller if he could run the branch line. The Fat Controller agreed and, as a result, Arthur now has his own branch line.
- For some reason, it was said that the branch line was new in the seventh season, but this line was already introduced in the fifth season.
- Since the fifteenth season, there is no longer ballast underneath the rails and they are built into the concrete.