............. 1" x 3" white oak.
Bolster springs, elliptic, length, ......... 30" 32"
Equalizing springs, double coil,
outside dimensions,................... 4-7/8" x 7-1/2" 3-5/8" x 6"
Wheels, cast steel spoke center,
steel tired, diameter,.................... 33-3/4" 30"
Tires, tread M. C. B. Standard,......... 2-5/8" x 5-1/4" 2-5/8" x 5-1/4"
Axles, diameter at center,.................. 6-1/2" 4-3/4"
Axles, diameter at gear seat,............... 7-13/16"
Axles, diameter at wheel seat,.............. 7-3/4" 5-3/4"
Journals,................................... 5" x 9" 4-1/4" x 8"
Journal boxes, malleable iron,
M. C. B. Standard,....................................
Both the motor and the trailer trucks have been designed with the
greatest care for severe service, and their details are the outcome of
years of practical experience.
CHAPTER IX
SIGNAL SYSTEM
Early in the development of the plans for the subway system in New
York City, it was foreseen that the efficiency of operation of a road
with so heavy a traffic as is being provided for would depend largely
upon the completeness of the block signaling and interlocking systems
adopted for spacing and directing trains. On account of the importance
of this consideration, not only for safety of passengers, but also for
conducting operation under exacting schedules, it was decided to
install the most complete and effective signaling system procurable.
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