On Taiwan's Alishan line, Gabe investigates switchbacks, forest routes, station signals, engineering, and the workers who keep a celebrated train moving through difficult terrain. Mei-Lin knows every timetable, takes accuracy personally, and becomes Tala's most cheerful rival within minutes. A timing Crossing reveals station children who once used whistles, ticket marks, and changing departures to warn people when the official route became unsafe. As Tala compares the new sequence with clues gathered across the world, the schedule begins pointing toward a long-awaited moment - one that may require the whole family to arrive together.