The shoe is shown in the photograph on
page 114. The shoe is held in contact with the third rail by
gravity reinforced by pressure from two spiral springs. The support
for the shoe includes provision for vertical adjustment to compensate
for wear of car wheels, etc.
CHAPTER VI
ELECTRICAL EQUIPMENT OF CARS
In determining the electrical equipment of the trains, the company has
aimed to secure an organization of motors and control apparatus easily
adequate to operate trains in both local and express service at the
highest speeds compatible with safety to the traveling public. For
each of the two classes of service the limiting safe speed is fixed by
the distance between stations at which the trains stop, by curves, and
by grades. Except in a few places, for example where the East Side
branch passes under the Harlem River, the tracks are so nearly level
that the consideration of grade does not materially affect
determination of the limiting speed. While the majority of the curves
are of large radius, the safe limiting speed, particularly for the
express service, is necessarily considerably less than it would be on
straight tracks.
The average speed of express trains between City Hall and 145th Street
on the West Side will approximate 25 miles an hour, including stops.
The maximum speed of trains will be 45 miles per hour. The average
speed of local and express trains will exceed the speed made by the
trains on any elevated railroad.
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