Question: Which Australian suburban railway network had the song "Dumb Ways to Die" composed for them? 

Context paragraphs:
Mumbai serial train blasts investigations: The following is the account given by the Mumbai Police Anti-Terrorist Squad of the investigation of the July 11, 2006 Mumbai serial train blasts which killed 209 people and injured over 700.  A series of seven bomb blasts that took place over a period of 11 minutes on the Suburban Railway in Mumbai, the capital of Indian state of Maharashtra and the nation's financial capital.  The bombs were set off in pressure cookers on trains plying the Western line of the Suburban Railway network.  The convicts have been punished.  5 were sentenced to death and 7 were sentenced to life in prison.

Ollie McGill: Oliver James "Ollie" McGill (born 2 November 1981) is an Australian musician who is the keyboard player and backing vocalist for The Cat Empire.  He composed "Dumb Ways to Die" for Metro Trains Melbourne.  McGill is also a member of several other Melbourne-based bands, including The Genie (a fusion band), The Conglomerate (a modern jazz quartet), Peaking Duck, The Future, 77, and Past Ollie's Bedtime.

Kodambakkam railway station: Kodambakkam railway station is a railway station on the Chennai Beach–Chengalpattu section of the Chennai Suburban Railway Network.  It serves the neighbourhood of Kodambakkam, Vadapalani, and Ashok Nagar.  The railway station was already in existence when the Madras Egmore-Kanchipuram suburban railway was opened in 1911.

2006 Mumbai train bombings: The 11 July 2006 Mumbai train bombings were a series of seven bomb blasts that took place over a period of 11 minutes on the Suburban Railway in Mumbai, the capital of the Indian state of Maharashtra and the nation's financial capital.  The bombs were set off in pressure cookers on trains plying the Western line of the Suburban Railway network.  209 people were killed and over 700 were injured.

Mumbai Suburban Railway: Mumbai Suburban Railway consists of exclusive inner suburban railway lines augmented by commuter rail on main lines serving outlying suburbs to serve the Mumbai Metropolitan Region.  Spread over 465 km , the suburban railway operates 2,342 train services and carries more than 7.5 million commuters daily.  By annual ridership (2.64 billion), the Mumbai Suburban Railway is one of the busiest commuter rail systems in the world and it has some of the most severe overcrowding in the world.  Trains run from 04:00 until 01:00, and some trains also run up to 02:30.

Vyasarpadi Jeeva railway station: Vyasarpadi Jeeva railway station is one of the railway station of the Chennai Central–Arakkonam section of the Chennai Suburban Railway Network.  It serves the neighbourhood of Vyasarpadi.  It is located 4 km to the northwest of Chennai Central railway station and 4 km to the west of Chennai Beach railway station.  The station lies at the western end of the 'diamond' junction of Chennai's railway network, where all the lines of the Chennai Suburban Railway meet.  It has an elevation of 5 m above sea level.

Metro Trains Melbourne: Metro Trains Melbourne, known colloquially as simply Metro, is the franchised operator of the suburban railway network in Melbourne, Australia.  Metro Trains Melbourne is a joint venture between MTR Corporation (60%), John Holland Group (20%) and UGL Rail (20%).

Washermanpet railway station: Washermanpet railway station is one of the railway station of the Chennai Beach–Gummidipoondi and Chennai Beach-Arakkonam sections of the Chennai Suburban Railway Network.  It serves the neighbourhood of Washermanpet, Korukkupet and Tondiarpet.  It is situated at Washermanpet, with an elevation of 9 m above sea level.  The station lies at the eastern end of the 'diamond' junction of Chennai's railway network, where all the lines of the Chennai Suburban Railway meet.

Kolkata Suburban Railway: The Kolkata Suburban Railway is a suburban rail system serving the suburbs surrounding the city of Kolkata.  Railways such as this are important and heavily used infrastructure in India.  It is the largest suburban railway network in India by track length and number of stations.Introduced by the British in 1927/28, the electrified suburban railway of Kolkata had 2 parts viz Eastern section & BNR section.The Eastern Section Eastern Railway (ER), when introduced, ran from Howrah to Bardhhaman via Bandel as Main Line and via Kamarkundu as Chord Line.  The BNR Section South Eastern Railway (SER)when introduced, ran from Howrah to Midnapore.Now Kolkata Sub-Urban Railway has 348 stations and a track length of 1,172 km.  The suburban railway operates 1450 EMU services and 159 MEMU services carrying 3.1 million (31.51 lakhs) people daily.  It runs from 4 a.m to 2 a.m in the night.

Split Suburban Railway: The Split Suburban Railway (Croatian: "Splitska gradska željeznica" ) is a suburban railway network in Split, Croatia.  The railway was opened on refurbished existing tracks on December 10, 2006.  It consists of one line serving seven stations, running from Split-Harbour to Kaštel Stari, but the line is being revamped with new stations and the reconstruction of existing ones.  The line passes through two tunnels within the city centre of Split, and it is planned that within these tunnels metro-like stations will be opened to serve the city centre.  The line is 17.8 km long and an average train ride lasts for 25 minutes.

Supporting paragraphs: Ollie McGill Metro Trains Melbourne
Answer: Metro Trains Melbourne