Power
From its inception, the subway used trolleys powered by electricity from overhead lines, made possible by the invention of the trolley pole in 1880 by Frank J. Sprague. However, the modern line has been pantograph-only since the trolley wires were modified in the 1990s.
Read more about this topic: Tremont Street Subway
Famous quotes containing the word power:
“What is good?—Everything that heightens the feeling of power, the will to power, power itself in man.”
—Friedrich Nietzsche (1844–1900)
“Nature has given women so much power that the law has very wisely given them little.”
—Samuel Johnson (1709–1784)
“The only government that I recognize—and it matters not how few are at the head of it, or how small its army—is that power that establishes justice in the land, never that which establishes injustice.”
—Henry David Thoreau (1817–1862)