Question: Black Forest, South Australia is bounded by the railway line that is a commuter line in what city?

Context paragraphs:
Seaford railway line: The Seaford railway line is a suburban commuter line in Adelaide, South Australia.

Carlingford railway line: The Carlingford railway line is a minor railway line in Sydney, Australia.  Opened in 1888, the line runs north-south between the suburb of Carlingford and the Main Suburban railway line at .  Passenger services on the line form part of the Sydney Trains commuter rail network and are marketed as the T6 Carlingford Line.  The railway line's small catchment, low patronage, short platforms and single track for much of its length mean the T6 generally operates as a shuttle service, with passengers changing at Clyde for T1 North Shore, Northern & Western Line services to the Sydney central business district and Parramatta.  Most of the line is planned for conversion to light rail as part of the Parramatta Light Rail network.  As a result, the line will permanently close.

Southern Black Forest: The Southern Black Forest (German: "Südschwarzwald" ) refers to the highest part of the Black Forest which was heavily transformed by ice age glaciation south of a line roughly from Freiburg im Breisgau to Donaueschingen.  The term High Black Forest is not quite identical; that usually includes the highest part of the Central Black Forest, southeast of the Elz valley, as well.  The Southern Black Forest Nature Park ("Naturpark Südschwarzwald") also takes in this area, extending across the whole of the High Black Forest as well as several peripheral areas.

Sunshine Coast Line: The Sunshine Coast Line is the current marketing name of what originally was the Tendring Hundred Railway Line, a branch off the Great Eastern Main Line in the East of England.  It links to the seaside resorts of and, via a branch, .  The line is part of the Network Rail Strategic Route 7, SRS 07.08, and is classified as a London & South East commuter line.  Passenger services on the line are currently operated by Greater Anglia.

Black Forest Railway (Württemberg): The Black Forest Railway (German: Schwarzwaldbahn) – also known as the Württemberg Black Forest Railway (Württembergische Schwarzwaldbahn) to distinguish it from the railway of the same name in Baden is a railway line in southern Germany from Stuttgart to Calw, passing through the foothills of the Black Forest, that was opened in stages between 1868 and 1872.  The section from Weil der Stadt to Calw was closed to passenger services in 1983 and goods traffic ceased in 1988.

Black Forest, South Australia: Black Forest is an inner southern suburb of Adelaide, South Australia.  It is located in the City of Unley, bounded by the Glenelg Tramline (north), the Seaford railway line (south), South Road (west) and East Avenue (east).

Keiyō Line: The Keiyō Line (京葉線 , Keiyō-sen ) is a railway line connecting Tokyo and Chiba in Japan, paralleling the edge of Tokyo Bay.  It is operated by the East Japan Railway Company (JR East).  The line forms part of what JR East refers to as the "Tokyo Mega Loop" (東京メガループ ) around Tokyo, consisting of the Keiyo Line, Musashino Line, Nambu Line, and Yokohama Line.  It provides the main rail access to the Tokyo Disney Resort and the Makuhari Messe exhibition center.  The terminus at Tokyo Station is located underground, some distance to the south of the main station complex approximately halfway to Yūrakuchō Station.  This means transfer between other lines at Tokyo Station can take between 15 and 20 minutes.  The name "Keiyō" is derived from the second characters of the names of the locations linked by the line, Tokyo (東京 ) and Chiba (千葉 ) .  It should not be confused with the Keiō Line, a privately operated commuter line in western Tokyo.

Tonsley railway line: The Tonsley railway line is a suburban commuter line in Adelaide, South Australia that stems off the Seaford line at Mitchell Park to end opposite Science Park and close to the Flinders University and the Flinders Medical Centre.  The line is single track for most of its length, from Celtic Avenue near Mitchell Park station to the terminus at Tonsley, with two intermediate stations.  Services operate every 30 minutes on weekdays with no trains operating at night or on the weekend.

Tokushima Line: The Tokushima Line (徳島線 , Tokushima-sen ) is a railway line in Tokushima Prefecture, Japan, owned and operated by Shikoku Railway Company (JR Shikoku).  The Tokushima Line connects Sako Station in Tokushima and Tsukuda Station in Miyoshi from west to east in central Tokushima Prefecture.  As the line parallels the Yoshino River, it is officially nicknamed the "Yoshino River Blue Line" (よしの川ブルーライン ) .  In addition to linking Tokushima and Kōchi prefectures, the line's eastern half serves the city of Tokushima as a commuter line.

Black Forest Railway (Baden): The Baden Black Forest Railway (German:Badische Schwarzwaldbahn) is a twin-track, electrified railway line in Baden-Württemberg, Germany, running in a NW-SE direction to link Offenburg on the Rhine Valley Railway ("Rheintalbahn") with Singen on the Upper Rhine Railway ("Hochrheinbahn").  Passing directly across the Black Forest, through spectacular scenery, the route is 150 km long, ascends 650 metres from lowest to highest elevation, and passes through 39 tunnels and over 2 viaducts.  It is still the only true mountain railway in Germany to be built with two tracks, and is the most important railway line in the Black Forest.  It was built between 1863 and 1873, utilizing plans drawn up by Robert Gerwig.

Supporting paragraphs: Black Forest, South Australia Seaford railway line
Answer: Adelaide