Question: When did the railway line servicing Exeter and a suburb 14 km north-west of Adelaide close?

Context paragraphs:
Jastrzębia Góra: Jastrzębia Góra (German: "Habichtsberg" , Kashubian: "Pilëce" or "Jastrzãbiô Góra") is a village on the south coast of the Baltic Sea in the Kashubia, in the administrative district of Gmina Władysławowo, within Puck County, Pomeranian Voivodeship, in northern Poland.  It lies approximately 7 km north-west of Władysławowo, 14 km north-west of Puck, and 55 km north-west of the regional capital Gdańsk.  Prior to January 1, 2015 it was a part of the town Władysławowo.

Sieraków Śląski: Sieraków Śląski (German: "Schierokau" ) is a village in the administrative district of Gmina Ciasna, within Lubliniec County, Silesian Voivodeship, in southern Poland.  It lies approximately 4 km north-west of Ciasna, 14 km north-west of Lubliniec, and 67 km north-west of the regional capital Katowice.

Budne-Żarnowo: Budne-Żarnowo is a village in the administrative district of Gmina Goniądz, within Mońki County, Podlaskie Voivodeship, in north-eastern Poland.  It lies approximately 3 km north-west of Goniądz, 14 km north-west of Mońki, and 53 km north-west of the regional capital Białystok.

Bukowie, Opole Voivodeship: Bukowie (German: "Buchwald" ) is a village in the administrative district of Gmina Wilków, within Namysłów County, Opole Voivodeship, in south-western Poland.  It lies approximately 8 km north-west of Wilków, 14 km north-west of Namysłów, and 60 km north-west of the regional capital Opole.

Ostrowy Baranowskie: Ostrowy Baranowskie is a village in the administrative district of Gmina Cmolas, within Kolbuszowa County, Subcarpathian Voivodeship, in south-eastern Poland.  It lies approximately 10 km north-west of Cmolas, 14 km north-west of Kolbuszowa, and 43 km north-west of the regional capital Rzeszów.

Czerna, Głogów County: Czerna is a village in the administrative district of Gmina Żukowice, within Głogów County, Lower Silesian Voivodeship, in south-western Poland.  It lies approximately 8 km north-west of Żukowice, 14 km north-west of Głogów, and 103 km north-west of the regional capital Wrocław.

Gare d'Auray: Auray is a railway station in Auray, Brittany, France.  The station was opened on 21 September 1862 is located on the Savenay–Landerneau railway, Auray–Quiberon railway and Auray–Pontivy railway.  The station was built by the operator of the Paris - Orleans railway line.  Today, the station is served by TGV (high speed), Intercités (long distance) and TER (local) services operated by the SNCF.  The line to Pontivy was opened in December 1864, and the line to Quiberon was opened in July 1882.  The Auray - Pontivy railway line closed to passenger traffic in October 1949, and is now only used to transport freight.  The station is 2 km north-west of the centre of Auray.

Tupadły, Pomeranian Voivodeship: Tupadły (German: "Tupadel" , Kashubian: "Tëpadła" ) is a village in the administrative district of Gmina Władysławowo, within Puck County, Pomeranian Voivodeship, in northern Poland.  It lies approximately 7 km north-west of Władysławowo, 14 km north-west of Puck, and 55 km north-west of the regional capital Gdańsk.  Prior to January 1, 2015 it was a part of the town Władysławowo.

Semaphore railway line: Semaphore railway line was a railway line in the Australian state of South Australia located in the north-west of Adelaide servicing the suburbs of Semaphore and Exeter.  It had two stations: Semaphore and Exeter.  The line opened in 1878 and closed in 1978.

Semaphore, South Australia: Semaphore is a suburb in the Australian state of South Australia located in north-west of Adelaide on the Gulf St Vincent coastline of the LeFevre Peninsula about 14 km from the Adelaide city centre.

Supporting paragraphs: Semaphore railway line Semaphore, South Australia
Answer: 1978