Mainline (pronounced meyn-lahyn)
(1) A slang term for the intravenous (injected directly into a vein as opposed to subcutaneous (skin popping)) use of injectable drugs (historically associated most with opium and its derivatives, especially heroin); a principal or prominent vein into which a drug can be injected.
(2) To use, enjoy or imbibe something without restriction.
(3) The normal, established, or widely accepted position; major (a synonym of mainstream although without any of the the negative connotations mainstream has in recent years acquired.
(4) In rail transport (1) of or pertaining to the principal route or line of a railway or (2) of or pertaining to a surface railway as distinct from an underground, elevated or light rail one (originally as main line or main-line).
(5) In computing, to integrate (code etc) into the main repository for a software project, rather than separate forks.
(6) In civil aviation, an airline's main operating unit, as opposed to codeshares or regional subsidiaries (by extension from the railroad use).
(7) As Mainlinie (line of the Maine), a (historical and political) boundary between northern and southern Germany, roughly following the River Main.
(8) In chess, of a sequence of opening moves, the principal, most important, or most often played variation of such (ie the "main line", the orthodox sequence of opening moves considered to be "best play").
(9) In foodie slang, voraciously to consume.
(10) In longline fishing, the central line to which the branch lines with baits are attached.
(11) In plumbing, the pipeline carrying wastewater to the public drains or a septic tank.
(12) In the US and Australia, related but different models of Ford cars sold during the 1950s.
1841 (1933-1934 as applied to injectable drugs): All senses of mainline (sometimes variously as main-line or with initial capital) are Americanisms and a compound of main + line. Main is from the Middle English mayn, main, maine, mæin & meyn, from main (noun) and related to the Old English mægen (strong, main, principal) and the Old Norse megn & megenn (strong, main). It was cognate with Old High German megīn (strong, mighty) from which Modern German gained Möge & Vermögen (power, wealth) and akin to the Old English magan (to be able to). Line is from the Middle English line & lyne, from Old English līne (line, cable, rope, hawser, series, row, rule, direction) from the Proto-Germanic līnǭ (line, rope, flaxen cord, thread) from the Proto-Germanic līną (flax, linen), from the primitive Indo-European līno (flax). Influenced in Middle English by the Middle French ligne (line), from Latin linea, it was cognate with the Scots line (line), the North Frisian liin (line), the West Frisian line (line), the Dutch lijn (rope, cord), the German Leine (line, rope), the Danish line (rope, cord), the Swedish lina (line, rope, wire) and the Icelandic lína (line). It was related also to Dutch lijn (flax), the German Lein (flax, linen), the Gothic lein (linen, cloth), the Latin linea (linen, thread, string, line) & linum (flax, thread, linen, cable), the Ancient Greek λίνον (línon) (flax, linen, thread, garment), the Old Church Slavonic линъ (linŭ) (flax), the Russian лён (ljon) (flax), the Lithuanian linai (flax) and the Irish līn (lion) (flax). The oldest sense of the word is "rope, cord, thread"; from this the senses "path" & "continuous mark" were derived. Mainline is a noun in the sense of railways and a verb (used without object) if injecting drugs; those doing the latter known, inter alia, as "mainers" or "mainliners", the mainlined not infrequently ending up on a pathologist's autopsy table. Mainline is a noun, verb & adjective, mainliner is a noun and mainlinging & mainlined are verbs; the noun plural is mainlines.
Ford in the US produced the Mainline between 1952-1956. It was the base-model of its three tier offering (Ford at that time in the US producing a single range of passenger cars), the more highly specified models being the Customline and premium-level Crestline. The name was dropped for 1957 when the layers in the range was expanded to four (Custom, Custom 300, Fairlane & Fairlane 500) although this had nothing to do with the association of “mainline” with injecting drug users; while that connection had existed since 1933, not until the 1960s did it in that sense come into general use. In the US, the Mainline was offered as a sedan with two (informally dubbed "Tudor") or four doors (Fordor), a business coupe (the two-door sedan with no rear seat, a configuration aimed at the “business traveller” who travelled alone and valued additional storage space) and (between 1952-1954) a two-door a station wagon (called Ranch Wagon); convertibles were restricted to the more expensive lines. A classic “stripper” (ie “stripped” of much trim and non-essential accessories so able to be sold at a lower price), as a consumer level product the Mainline was rather obscure, often mentioned only in the small print in catalogues and brochures and rarely afforded the honor of a photograph. That was because, in an era of rising prosperity, it really wasn’t photogenic, the exterior lacking much of the chrome adorning the Customline & Crestline (although Studebaker would would later go further down the austerity path with its “Scotsman” models) while the interiors drably were utilitarian, rubber matting on the floor rather than carpet. One quirk of production-line meant the Mainline did retain the extravagance of a chrome hood emblem, the cost of a separate run of hoods without the screw-holes higher than that of the emblem and the minute or so of labor required for the fitment. Mercedes-Benz later (and belatedly) discovered similar math when some chrome trim was omitted from the tail-fins on the lower cost versions of its Heckflosse range (1959-1968), the labor required to hand-finish the metal a more expensive process than fitting the part and its fitting. The Mainline's equipment levels were similarly spartan, only the driver's side fitted with a sun visor while passengers were denied armrests and unless paying extra to the dealer, no cigarette lighter was included, a painted metal plug (ancestor of the later “switch blanks) covering the hole in the dashboard. An ashtray was however included and, in a sign of the times, the cigarette lighter was a popular option.
Australia was a smaller market and neither the three trim options nor all the body styles were offered, sales between 1952-1959 restricted to the four-door Customline (some station wagons were imported in fully-built form) and a locally developed “coupé utility”, created by adding a rear section in the style of a light pickup truck. A feature of the Australian market since the 1930s, in the Australian way, the six syllable “coupé utility” quickly was shortened to “ute”, remaining a profitable market sector until motor vehicle production in the country ceased in 2017. The coupé utility used the Mainline name and was built on the station wagon chassis with the addition of the convertible’s X-member to permit a higher load carrying capacity, a further quirk being the Australian Fords continued until 1954 to use the old flathead V8 (introduced in 1932 not in the US used in passenger cars after 1953), the new overhead valve (OHV) Y-Block V8 not introduced until 1955. The Mainline remained in the Australian line-up until 1959 when the Fairlane replaced the Customline but Ford didn’t develop a coupé utility version of the new car, the body style instead offered on the compact platform (standard-size in Australian terms) when the Falcon (1960-2016) entered local production. The Australian ute proved influential across the Pacific, Ford in the US offering several generations of Ranchero (1957-1979), the success of which encouraged Chevrolet to adopt the same concept, an El Camino model sold between 1959-1960 and 1964-1987.
GM (General Motors) and Chrysler of course also had “stripper” models in their ranges the cheapest and most basic being those offered respectively by Chevrolet and Plymouth but the concept was in every case became corporation-wide although to speak of the cheapest Cadillacs as “strippers” was misleading and it’s better to refer to them as “selectively de-frilled” (something distinct from the more general “de-contenting ” strategy GM would begin in the late 1960s). For sociological reasons, the “cheapest Cadillac” once had real appeal because in the US it was for decades the ultimate “aspirational brand” appealing very much to those who really couldn’t afford one; the extent of Cadillac purchasing by the “lower middle class” was once of the markers of the “American dream” although caution did need to be exercised: tick to many of the option boxes for a “stripper” Cadillac Calais and the invoice price began to overlap with that of the even more aspirational DeVille. While the Mainline may not much have been seen in the brochures, in local newspaper advertising, frequently one would appear, usually with its temptingly low price in large bold type (often with an exclamation mark). That price typically was between 15-20% less than what buyers typically paid for a Customline or Crestline (a “new Ford” in the public imagination) but the advertising copy in the newspaper tended not to dwell on details and in the pre-internet age, the sight of $1,389! was enough to entice buyers to visit the showroom. Of course, once there they would discover a Mainline business coupe wasn’t all that appealing and the salesman would agree, showing them the better value offered by a two-door Customline sedan at $1,570. Dealerships really didn’t want to see too many Mainlines because the profit margins were slim compared to the more expensive Fords although the most skilled salesmen (they were then all men) could “add a little fat” by “up-selling” the odd accessory (mudflaps, whitewall tyres, the cigarette lighter etc).
Darlington was known for the infamous “Darlington stripe”, left on the right side of the cars because the angle of the track made it challenging for drivers to maintain a competitive speed without sometimes “kissing the wall” at turns three & four. The drivers called the concept “fender prints” (an allusion to the various shades of paint the circulating cars left on an oval’s wall) but Darlington was especially honoured with the notorious “Darlington stripe” because, over the course of a race, multiple “scrapes” were inevitable. The start-finish line on the unusual egg-shaped track was in 1997 moved so the critical section now starts at turn one and although the guard rails are now less hazardous, the Darlington stripe remains something of a NASCAR rite of passage.
The sales tactic must have worked because relatively few private buyers chose Mainlines, despite a saving of $180-odd being in 1952 a compelling argument (the method of calculation vary but US$180 expressed in 2026 purchasing power would be over US$2,000). That was however just side-business for the Mainline. The real reason the industry built strippers was for fleet sales to corporations and government instrumentalities such as the military, police forces, fire departments and such. While a saving of $180 might be enough to persuade a few frugal customers to forgo carpets and armrests, for purchasing managers buying by the dozen (or even the thousand), the lower unit-cost multiplied into a lot of money and of course, at those volumes, further discounts were applied. The other minor career of the stripper came on race tracks or drag strips, buyers for that purpose wanting the cheapest, lightest platform; for them armrests and cigarette lighters were just pointless excess weight and, wherever possible, they undertook further “striping”, discarding anything not absolutely essential. For them, the Mainline was a good starting-point.
Map of southern England's Great Western Main Line.
Main Line had since 1841 been used generally to mean "principal line of a railway" and the Main Line was once Philadelphia's most desired suburban district. Once just another rural hamlet, in the 1870s & 1880s it was transformed by the Pennsylvania Railroad Company that built expensive housing developments and hotels, hence the association of "Main Line" with the meaning "affluent area of residence", noted by 1917 and eventually used in that sense without capital letters and as the unhyphenated "mainline". Essentially creating a fashionable suburb, the Railroad's urban development project linked Philadelphia to Paoli along the Paoli Local train-line via the station stops Overbrook, Merion, Narberth, Wynnewood, Ardmore, Haverford & Bryn Mawr. Eventually, the Main Line connected Philadelphia with Pittsburgh via Harrisburg but was later split into two lines, Amtrak's Philadelphia to Harrisburg Main Line and the Norfolk Southern Railway's Pittsburgh Line.
A depiction of Lindsay Lohan's "mainlines" (digitally altered image, left), an illustrative diagram of an urban light-rail system showing the mainlines (thick lines) and branch lines (thin lines) (centre) and a human's entire blood circulatory system, created from a corpse donated (by the subject) for the purpose (right). The technique used (right) is called “vascular corrosion casting”, achieved by replacing the blood in arteries, veins & capillaries with a specially mixed resin; after the resin has set and cured, all other tissue is dissolved in a highly alkaline chemical (typically sodium hydroxide). To ensure the resin remains, it needs to be of a specific viscosity, with a chemical composition a-reactive to both natural tissue and the chemical used in the dissolution process.
The original slang among drug users, dating from 1933, was "mainline" the noun, referring the principal or prominent vein into which a drug was most effective if injected. The verb in the sense of "inject (drugs) intravenously" was noted the following year although the associated verb "mainlining" didn't enter regular use until the mid-1960s and the unfortunate companion verb "mainlined" (dead from a drug overdose) soon followed, referred to in that sense by Mimi Fariña (1945–2001) in the song In the Quiet Morning (1970), recorded by Joan Baez (b 1941) after the messy, drug-related death of singer Janis Joplin (1943–1970). Joplin's death, although technically caused by an impact injury, happened under the influence of heroin. Counterintuitively, despite injecting drug-use being so obviously associated with veins and arteries, it seems it was the imagery of main and secondary railway lines rather than the human vascular system (also called the circulatory system) that prompted the simile of mainline in drug-related slang. It was probably because of the general familiarity with the word being used to describe train tracks and the often-seen graphical representation of them at stations and in carriages. Even in medicine, mainline appears hardly used by physicians when speaking of arteries, veins or capillaries, specific anatomical names (femoral artery, jugular vein etc preferred), the term apparently not useful within the profession because of the need for precision when discussing such things although it may be handy for pathologists who work mostly "in retrospect". However, there are citations where physicians and neurologists have adopted a similar metaphor (based perhaps on the "rabbit warrens" that are hospitals) to explain the process of the brain using the “back passages” to restore blood-flow to areas affected by a stroke which has blocked the “main passage”, again drawing on the idea of primary and secondary lines.
In the Quiet Morning (1970) by Mimi Farina © Universal Music Publishing Group, recorded by Joan Baez.
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