Mr. Conductor has problems of his own; the mysterious gold dust that allows him to magically teleport from place to place is running low, and therefore cannot travel from Shining Time to Sodor or back again.
Mr. Conductor has problems of his own. The mysterious gold dust is running low. This mysterious gold dust allows him to magically teleport from place to place. The mysterious gold dust cannot travel from Shining Time to Sodor or back again. This mysterious gold dust allows him to magically teleport from place to place therefore.