After the events of TATMR 2, (written by yours truly) Lily Stone is set to begin her Junior Conductor training. With her tank engine pal, Thomas by her side, the two friends go on fun, magical adventures across the island of Sodor. However with Diesel 10 back on the rails and ready to cause confusion and delay; Lily and Thomas must work together to keep Lady, the conductors' and their magic out of Diesel 10's clutches.
