Koznitsa (tunnel)

Koznitsa

Overview
Line	Sofia–Karlovo
Operation
Constructed	1949–1951
Opened	June 6, 1951
Owner	National Railway Infrastructure Company
Technical
Length	5,808.5 m
No. of tracks	single track
Track gauge	1,435 mm (4 ft 8 ^1⁄2 in) (standard gauge)
Electrified	25 kV
Highest elevation	818 m
Lowest elevation	798 m
Grade	2.0‰ / 6.4‰
Route map
Koznitsa (tunnel) (Bulgaria)

Koznitsa is a railway tunnel under the Koznitsa ridge in the Stara planina (Balkan Mountains), the longest tunnel in Bulgaria. The tunnel is located between the Bulgarian towns of Koprivshtitsa and Klisura and is 5,808 m long.^[1][2] It is the seventh tunnel on the Sofia–Karlovo line, starting at the exit of Koprivshtitsa station and ending just before Stryama station. Along its entire length the tunnel is straight and at Koprivshtitsa the lights of the locomotive are visible a long distance into the tunnel.

References

1. Рулев, Димитър; Марков, Минчо (2007). Електрифицираните железници на България, т. 1 (1903-1995) (in Bulgarian). София. p. 276.
2. Деянов, Димитър (2005). Железопътната мрежа в България 1866-1975 (in Bulgarian). София: изд. „Булхаус“ Стара Загора. p. 224. ISBN 954-9364-05-4.

Coordinates: 42°41′54″N 24°22′55″E / 42.69833°N 24.38194°E