Question: The Main North Line offers a ferry that has a terminus in which capital city of New Zealand?

Context paragraphs:
Ashley, New Zealand: Ashley is a small rural area in North Canterbury, in the South Island of New Zealand.  It used to have a railway station on the Main North Line that runs through the village.  As of the 2013 New Zealand census, 1083 people live in Ashley.

South Island Main Trunk Railway: The Main North Line between Picton and Christchurch and the Main South Line between Lyttelton and Invercargill, running down the east coast of the South Island of New Zealand, are sometimes together referred to as the South Island Main Trunk Railway (SIMT).  Construction of a main line running the length of the east coast began in the 1860s, not completed all the way from Picton to Invercargill until 1945.

Rail transport in Christchurch: Rail transport in Christchurch, the largest city in the Canterbury region of New Zealand's South Island, consists of two main trunk railway lines intersecting in the suburb of Addington, carrying mainly long-haul freight traffic but also two long distance tourist-oriented passenger trains.  The two lines are the Main North Line and Main South Line, collectively but unofficially known as the South Island Main Trunk Railway.  There is a heritage line at the Ferrymead Historic Park that is operated with steam, electric, and diesel motive power hauling tourist-oriented services.

Christchurch Railway Station (New Zealand): Christchurch Railway Station is in the Canterbury region of New Zealand's South Island.  It is on the Main North Line at Addington junction, and is the only remaining passenger railway station in the city: suburban passenger trains were cancelled due to lack of demand in the 1970s.  It is the terminus of the South Island’s two remaining long-distance passenger trains, the TranzAlpine and the Coastal Pacific.

Culverden Express: The Culverden Express was a passenger train operated by the New Zealand Railways Department between Christchurch and Culverden.  It ran from 1886 until its replacement by the "Picton Express" in 1945 and its route followed both the Main North Line and the Waiau Branch.  In the mid-1920s, the main northern terminus became Parnassus, and to reflect this, the name was changed to the Parnassus Express.

Hawarden, New Zealand: Hawarden is a small town in the Canterbury region of New Zealand's South Island.  It is located near Waikari, just off State Highway 7.  From 15 December 1884 until 15 January 1978, the town was served by the Waiau Branch, a branch line railway that at one stage was planned to become the Main North Line to Nelson and Blenheim.  The Weka Pass Railway restoration project once had plans to retain the line through Hawarden, but later chose to terminate their line in Waikari.  Some relics of the old railway line still remain at the site of Hawarden's railway station.

Main North Line, New Zealand: The Main North Line, sometimes referred to as part of the South Island Main Trunk Railway, is a railway line that runs north from Christchurch in New Zealand up the east coast of the South Island through Kaikoura and Blenheim to Picton.  It is a major link in New Zealand's national rail network and offers a connection with roll-on roll-off ferries from Picton to Wellington.  It was also the longest railway construction project in New Zealand's history, with the first stages built in the 1870s and not completed until 1945.

Lynx Express: The Lynx Express was a long-distance passenger train in the South Island of New Zealand that ran the length of the Main North Line between Picton and Christchurch.  The service was operated by New Zealand Rail Limited business unit InterCity Rail.

Wellington: Wellington (Māori: "Te Whanganui-a-Tara" ) is the capital city and second most populous urban area of New Zealand, with 405,000 residents.  It is at the south-western tip of the North Island, between Cook Strait and the Rimutaka Range.  Wellington is the major population centre of the southern North Island and is the administrative centre of the Wellington Region, which also includes the Kapiti Coast and Wairarapa.  It is the world's windiest city, with an average wind speed of over 26 km/h, and the world's southernmost capital of a sovereign state.

Main South Line: The Main South Line, sometimes referred to as part of the South Island Main Trunk Railway, is a railroad line that runs north and south from Lyttelton in New Zealand through Christchurch and along the east coast of the South Island to Invercargill via Dunedin.  It is one of the most important railway lines in New Zealand and was one of the first to be built, with construction commencing in the 1860s.  At Christchurch it connects with the Main North Line to Picton, the other part of the South Island Main Trunk.

Supporting paragraphs: Main North Line, New Zealand Wellington
Answer: Wellington