Main definitions of main line in US English:

: main line1Main Line2

main line1


  • 1A chief railroad line.

    as modifier ‘a main-line station’
    • ‘At the same time, 24 major projects were successfully achieved and BR became the only profitable main-line railway in Europe.’
    • ‘We had the fastest trains, a brand new underground network, the start of main-line electrification and free-flowing buses and trams.’
    • ‘One year ago, yesterday, 10 people were killed in the Selby crash when a Land Rover ended up on the East Coast mainline.’
    • ‘Despite the massive destruction to the railway system the main lines were cleared two days after the blast.’
    • ‘The closures would eliminate all but one at-grade crossing in the city along the railway company's main line.’
    • ‘The other key culpable person was the lead engineer who brought them out onto the main line.’
    • ‘On the main line railways the failure to take any steps towards renationalisation has left members utterly disillusioned.’
    • ‘The Alcan company shipped its bauxite from Port Esquiville, a short distance from Bodies, utilising the existing main-line railway.’
    • ‘Unlike train engineers, who get six months of training for their regular job, remote operators are not qualified for main-line work.’
    • ‘In addition to using the civil main lines, railways were constructed for purely military purposes, with no commercial value.’
    • ‘Some branch lines do not always branch off from the main line at the transfer station itself.’
    • ‘Kildare town has the best rail commuter service in the county, being served by regular mainline and Arrow services.’
    • ‘My first house was a red brick terrace in Folkestone, backing on to the main line railway.’
    • ‘He said there is no plan to expand the technology to main-line tracks such as the tracks between two cities.’
    • ‘After all, it's only a branch line, not a main line station.’
    • ‘This settlement also significantly benefits from a main line railway station.’
    • ‘Virgin main-line trains made additional stops, too.’
    • ‘For serious shopping, central London is about half an hour away by Underground or main-line rail service.’
    • ‘The line is Britain's busiest and most congested main-line, says the strategy.’
    • ‘Notices telling train passengers what to do in an air raid are being put up in all main line railway stations.’
    1. 1.1North American A chief road or street.
      • ‘It was a modern bus, one of the many vehicles put on to the main line routes and was fitted with CCTV so there will be a recording.’
      • ‘This applied particularly to the main lines of turnpike road constructed before 1811.’
      • ‘By State Statute, the Mayor of Salt Lake County has to approve all new main lines within Salt Lake County right-of-ways.’
      • ‘At first I was riding the main line through the braking bumps, and the suspension, as always, was still super smooth.’
      • ‘Each main line busway passenger must pay Rp 2,500 for a one-way trip.’
      main route, trunk route, main road, trunk road, trunk line, high road, highway
      View synonyms
    2. 1.2informal A principal vein as a site for a drug injection.


[with object]informal
  • Inject (a drug) intravenously.

    ‘Mariella mainlines cocaine five to seven times a day’
    • ‘She had mainlined morphine, but never more than 10 cc.’
    • ‘Her performance electrifies the story of the model who died of the virus she probably picked up by mainlining heroin.’
    • ‘Percodan is similar to codeine but is usually mainlined.’
    • ‘It begins with the great detective, Sherlock Holmes, mainlining on a 7% solution of cocaine.’
    • ‘Today, d-Meth is the most popular type in the U.S. and is the most potent, has far less side effects and does not need to be mainlined.’
    administer, introduce
    View synonyms


main line

/ˈmān ˈˌlīn//ˈmeɪn ˈˌlaɪn/

Main definitions of main line in US English:

: main line1Main Line2

Main Line2

proper noun

  • A popular name for a series of affluent suburbs west of Philadelphia in Pennsylvania, along the old Pennsylvania Railroad main line.