Abstract
The first section of the narrow-gauge railway line Septemvri-Dobrinishte was put into operation in the distant 1926, and the last sixth stage of it was completed in 1945. It is single line, non-electrified, with a track gauge of 760mm, which makes it unique for Bulgaria and the Balkans. Apart from its track gauge, the line impresses with its spiral ascents, maximum longitudinal slopes - up to 32 ‰, minimum radii of horizontal curves of 50m and the highest station on the Balkan Peninsula, Avramovo 1267.4m above sea level. Within a total length of 125 km, 35 tunnels, 23 bridges, retaining walls and numerous culverts have been built. The article presents the current state of the major engineering facilities along the line - bridges and tunnels, as well as the state of the superstructure of the railway. Its technical characteristics, which makes it a unique achievement, both in terms of transport structural facilities and for railway construction in general, are also commented.
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