Septemvri–Dobrinishte Narrow-Gauge Line – with a length of 125 km. It passes through 35 tunnels, 359 bridges and culverts, 26 stations and stops. It connects the valleys of the Mesta and Maritsa Rivers. Along the line is the highest train station on the Balkans – Avramovo (1267 m). In 2020, the Guardian Magazine ranked the line among the 10 most preferred rail journeys in the world.