brightline

American  

[brahyt-lahyn] / ˈbraɪtˌlaɪn /

Or bright-line

adjective

1. (of rules, standards, etc.) unambiguously clear.

   This muddies the waters of what should be a brightline rule.

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noun

1. Physical Chemistry. brightline spectrum.

Etymology

Origin of brightline

bright + line ¹

Example Sentences

The Atlantic describes the Brightline train as a luxurious ride for high rollers but paints a downscale cast to those who are run over by it.

From The Wall Street Journal

Though Florida’s Brightline train between Orlando and Miami isn’t a bullet train—it maxes out at Amtrak-like 125 mph—it’s been giving “higher speed” rail a bad rep.

From The Wall Street Journal

The Brightline train service runs from Miami to West Palm in a little more than an hour and costs as little as $20 one way.

From The Wall Street Journal

The line from Los Angeles to Las Vegas, Brightline West, is a privately-run project.

From BBC

Kelly stressed that the project will affect states beyond California with a goal to establish a southwest corridor that would include Arizona and New Mexico, and reiterated plans to connect to the privately owned Brightline West project, that would connect Southern California to Las Vegas.

From Los Angeles Times