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FAST AND HEAVY RAILWAY SERVICE. 241
tion with this class of work on account of its great con-
venience in the matter of insulation, ease of placing, and
elimination of the bonding difficulty. Its net cost is about
the same as that of a steel third rail.
One of the standard open cars of the Nantasket Beach
line is shown in Fig 125. Each has sixteen seats and will
accommodate fully one hundred passengers. Sixteen of
these are fitted up as motor cars and similar cars are used
FIG. 125
as trailers. Each motor car is fitted with two G. E. 2000
motors of the type shown in Fig. 126 arranged for series-
parallel control. The cars are fitted with air brakes and air
whistle, the air being pumped into a tank by a motor auto-
matically controlled by the pressure. ‘The motors are good
for over a hundred horse power each at full field, and on the
straight level stretch in the middle of the Nantasket Beach
line a speed of more than seventy miles per hour has been
reached. Atsuch a speed the motion is quite smooth and
the great speed cannot be realized except by timing the