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:
“It would be disingenuous, however, not to point out that some things are considered as morally certain, that is, as having sufficient certainty for application to ordinary life, even though they may be uncertain in relation to the absolute power of God.”
—René Descartes (1596–1650)
“Guilty. Guilty. My evil self is at that door, and I have no power to stop it.”
—Cyril Hume, and Fred McLeod Wilcox. Dr. Morbius (Walter Pidgeon)
“He utters substantial English thoughts in plainest English dialects.... Indeed, for fluency and skill in the use of the English tongue, he is a master unrivaled. His felicity and power of expression surpass even his special merits as historian and critic.”
—Henry David Thoreau (1817–1862)