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:
“My great panacea for making society at once better and more enjoyable would be to cultivate greater sincerity.”
—Frances Power Cobbe (1822–1904)
“What you fail to understand is the power of hate. It can fill the heart as surely as love can.”
—Earl Felton, and Richard Fleischer. Captain Nemo (James Mason)
“Another success is the post-office, with its educating energy augmented by cheapness and guarded by a certain religious sentiment in mankind; so that the power of a wafer or a drop of wax or gluten to guard a letter, as it flies over sea over land and comes to its address as if a battalion of artillery brought it, I look upon as a fine meter of civilization.”
—Ralph Waldo Emerson (1803–1882)