[Illustration: SIDE AND END ELEVATIONS OF ALTERNATOR.]
[Illustration: SIDE ELEVATION AND CROSS SECTION OF ALTERNATOR WITH
PART CUT AWAY TO SHOW CONSTRUCTION.]
It being considered impracticable to predict with entire certainty the
ultimate traffic conditions to be met, the generator plant has been
designed to take care of all probable traffic demands expected to
arise within a year or two of the beginning of operation of the
system, while the plans permit convenient and symmetrical increase to
meet the requirements of additional demand which may develop. Each
express train will comprise five motor cars and three trail cars, and
each local train will comprise three motor cars and two trail cars.
The weight of each motor car with maximum live load is 88,000 pounds,
and the weight of each trailer car 66,000 pounds.
The plans adopted provide electric equipment at the outstart capable
of operating express trains at an average speed approximating
twenty-five miles per hour, while the control system and motor units
have been so chosen that higher speeds up to a limit of about thirty
miles per hour can be attained by increasing the number of motor cars
providing experience in operation demonstrates that such higher speeds
can be obtained with safety.
The speed of local trains between City Hall and 96th Street will
average about 15 miles an hour, while north of 96th Street on both the
West side and East side branches their speed will average about 18
miles an hour, owing to the greater average distance between local
stations.
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