# Mainline

Mainline, Main line, or Main Line may refer to:

## Transportation
### Railway

* Main line (railway), the principal artery of a railway system
* Main line railway preservation, the practice of operating preserved trains on an operational railway network

#### Asia
##### Bangladesh

* Main line, MRT Line 2 of Dhaka Metro Rail

##### India

* Ahmedabad–Mumbai main line
* Chennai Central–Mysuru main line
* Gandhidham–Ahmedabad main line
* Howrah–Bardhaman main line
* Howrah–Chennai main line, between Chennai and Kolkata
* Howrah–Delhi main line
* New Delhi–Chennai main line

##### Japan

* Arashiyama Main Line
* Chichibu Main Line
* Chikuhō Main Line
* Chūō Main Line
* Eiden Eizan Main Line
* Fukushima Rinkai Railway Main Line
* Hakodate Main Line
* Hankyū Kōbe Main Line
* Hankyu Kyoto Main Line
* Hankyu Takarazuka Main Line
* Hanshin Main Line
* Hidaka Main Line
* Hiroden Main Line
* Hōhi Main Line
* Hokuriku Main Line
* Kagoshima Main Line
* Kansai Main Line
* Keihan Main Line
* Keikyū Main Line
* Keisei Main Line
* Kisei Main Line
* Kyūdai Main Line
* Meitetsu Nagoya Main Line
* Mizushima Main Line
* Muroran Main Line
* Nagasaki Main Line
* Nankai Main Line
* Nayoro Main Line
* Nemuro Main Line
* Nippō Main Line
* Ohmi Railway Main Line
* Ōigawa Railway Ōigawa Main Line
* Osaka Monorail Main Line
* Ōu Main Line
* Rumoi Main Line
* San'in Main Line
* Sanyo Electric Railway Main Line
* San'yō Main Line
* Sekihoku Main Line
* Senmō Main Line
* Shin'etsu Main Line
* Sōbu Main Line
* Sōtetsu Main Line
* Sōya Main Line
* Takayama Main Line
* Tōhoku Main Line
* Tōkaidō Main Line
* Toyama Chihō Railway Main Line
* Toyohashi Railroad Azumada Main Line
* Uetsu Main Line

##### Korea

* Trans-Korean Main Line

##### Pakistan

* Karachi–Peshawar Line, also referred to as Main Line 1

##### Philippines

* PNR North Main Line
* PNR South Main Line

##### Sri Lanka

* Main Line (Sri Lanka)

##### Thailand

* Chiang Mai Main Line, between Bangkok and Chiang Mai
* Ubon Ratchathani Main Line, between Ban Phachi Junction and Ubon Ratchathani

##### Turkey

* Adana – Mersin Main Line

#### Europe

* Main Line for Europe

##### Finland

* Finnish Main Line, between Helsinki and Oulu

##### Germany

* Baden main line, between Baden and Constance

##### Sweden

* Northern Main Line, between Gävle or Storvik and Ånge
* Southern Main Line, between Malmö and Katrineholm
* Western Main Line, between Stockholm and Gothenburg

##### United Kingdom

* Brighton Main Line
* Caledonian main line
* Chatham Main Line
* Chiltern Main Line
* Cornish Main Line
* East Coast Main Line
* Great Central Main Line
* Great Eastern Main Line
* Great Western Main Line
* Highland Main Line
* Main Line Preservation Group, an organisation that eventually became the Great Central Railway heritage railway
* Mainline Freight, a defunct UK railfreight company
* Midland Main Line
** Midland Mainline (train operating company), a defunct UK train-operating company
* North British Railway Main Line
* Penrhyn Main Line class, three narrow-gauge steam locomotives built for the Penrhyn Quarry Railway
* South Eastern Main Line
* South Humberside Main Line, between Doncaster and Cleethorpes
* South Wales Main Line
* South West Main Line
* West Anglia Main Line
* West Coast Main Line
* Wessex Main Line

#### North America
##### United States

* Cape Main Line, in Cape Cod, Massachusett
* IRT Manhattan Main Line, in New York City
* Main Line (Atlantic Coast Line Railroad)
* Main Line (Columbus to Chicago), a Pennsylvania Railroad line in Ohio, Indiana, and Illinois
* Main Line (Columbus to Indianapolis via Bradford), a Pennsylvania Railroad line in Ohio
* Main Line (Pennsylvania Railroad), between Philadelphia and Pittsburgh, Pennsylvania
* Main Line (Long Island Rail Road), between Long Island City and Greenport, New York
* Main Line (New York to Hoffmans), a nickname for the CSX Hudson Subdivision
* Main Line (NJ Transit), formerly part of the Erie Railroad, between Hoboken and Suffern, New Jersey
* Main Line (Pittsburgh to St. Louis), a Pennsylvania Railroad line between Ohio and Illinois
* Main Line (Reading Company), the former Reading main line between Philadelphia and Pottsville, Pennsylvania
* Main Line of Mid-America, a nickname of the former Illinois Central Railroad
* Main Line Subdivision, owned by CSX Transportation in Kentucky and Tennessee
* Main Street Line (MATA Trolley), a streetcar line in Memphis, Tennessee
* Metropolitan main line, a former rapid transit line in Chicago, Illinois
* North Side main line, a rapid transit line in Chicago, Illinois
* Old Colony Main Line, between Boston, Massachusetts and the South Shore
* Old Main Line Subdivision, between Relay (outside Baltimore) and Point of Rocks, Maryland
* Park Avenue main line, the former New York Central Railroad (now Metro-North Railroad) from Grand Central Terminal in Manhattan to Mott Haven Junction in the South Bronx
* Philadelphia Main Line
* Philadelphia to Harrisburg Main Line, part of the Pennsylvania Railroad Main Line now owned by Amtrak
* Philadelphia-to-Washington Main Line
* SEPTA Main Line, between West Philadelphia and Lansdale, Pennsylvania
* South Side Main Line (Chicago Transit Authority), in Chicago, Illinois
* Washington to Atlanta Main Line, owned by Norfolk Southern Railway

#### Oceania
##### Australia

* Main Line railway, Queensland
* South Line, Tasmania, Australia, also called the Main Line
* Tasmanian Main Line Company, a privately-owned railway that existed from 1872 to 1890

##### New Zealand

* Canterbury Interior Main Line, a proposed railway on the South Island

### Other transport

* Mainline (aeronautics), an airline carrier's non-regional service
* Main Line of Public Works, a package of legislation establishing freight transport between Philadelphia and Pittsburgh
* A toll road system where all vehicles stop at various locations on the highway to pay a toll
* BCN Main Line (Birmingham Canal Navigations Main Line), a canal between Birmingham and Wolverhampton, England
* Ford Mainline, a car model
* South Yorkshire Transport, a large bus operator in South Yorkshire, England which was renamed "Mainline" in 1993

## Music

* McKenna Mendelson Mainline, a seminal Canadian blues band
* "Mainline", a song by KISS on their 1974 album Hotter Than Hell
* "Mainline", a 1979 disco song by Black Ivory
* Mainline, a 2014 album by Australian hip-hop collective One Day.

## Businesses

* Main Line Broadcasting, a defunct American media company
* Main Line Health, a not-for-profit health system in Philadelphia, Pennsylvania
* Mainline Corporation, former Australian construction company
* Mainline Railways, a model railway brand now owned by Bachmann

## Computing

* BitTorrent (software), nicknamed mainline by developers denoting its official origins
* Mainline Linux, the Git repository of Linus Torvalds
* Trunk or mainline, the primary branch of a software project