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 breadth, what beauty and power of human nature and development there must be in a woman to get over all the palisades, all the fences, within which she is held captive!”
—Alexander Herzen (1812–1870)
“The virtue of the camera is not the power it has to transform the photographer into an artist, but the impulse it gives him to keep on looking.”
—Brooks Atkinson (1894–1984)
“Many readers judge of the power of a book by the shock it gives their feelings—as some savage tribes determine the power of muskets by their recoil; that being considered best which fairly prostrates the purchaser.”
—Henry Wadsworth Longfellow (1807–1882)