Chugging through the Highlands, windows down, doors open, is the best way to see the country’s emerald interior unfold — and this route is often lauded as one of the world’s greatest train journeys.

The trains will stop 10 minutes each at the Peradeniya, Nawalapitiya, Hatton, Great Western, Nanu Oya, Pattipola, Ohiya, Idalgassinna, Haputale, Bandarawela, Ella stations and at the Nine Arches ...