stretch" of fifty yards with rails not charged at all between the
sections. This change in the nature of the electricity is
repeated automatically every fifty miles, and obviates the
necessity of revolving machinery, the rails aiding communication.

"Magnetism being practically as instantaneous as gravitation, the
only limitations to speed are the electrical pressure at the
magnets, the resistance of the air, and the danger of the wheels
bursting from centrifugal force. The first can seemingly be
increased without limit; the atmospheric resistance is about to
be reduced by running the cars hermetically sealed through a
partial vacuum in a steel and toughened glass tube; while the
third has been removed indefinitely by the use of galvanized
aluminum, which bears about the same relation to ordinary
aluminum that steel does to iron, and which has twice the tensile
strength and but one third the weight of steel. In some cases
the rails are made turned in, so that it would be impossible for
a car to leave the track without the road-bed's being totally
demolished; but in most cases this is found to be unnecessary,
for no through line has a curve on its vast stretches with a
radius of less than half a mile. Rails, one hundred and sixty
pounds to the yard, are set in grooved steel ties, which in turn
are held by a concrete road-bed consisting of broken stone and
cement, making spreading rails and loose ballast impossible. A
large increase in capital was necessary for these improvements,
the elimination of curves being the most laborious part,
requiring bridges, cuttings, and embankments that dwarf the
Pyramids and would have made the ancient Pharaohs open their
eyes; but with the low rate of interest on bonds, the slight cost
of power, and great increase in business, the venture was a