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:
“History is a child building a sand-castle by the sea, and that child is the whole majesty of man’s power in the world.”
—Heraclitus (c. 535–475 B.C.)
“We know that madness belongs to love,—what power to paint a vile object in hues of heaven.”
—Ralph Waldo Emerson (1803–1882)
“Relying ... on the patronage of your good will, I advance with obedience to the work, ready to retire from it whenever you become sensible how much better choice it is in your power to make.”
—Thomas Jefferson (1743–1826)