NTERURBAN AND CROSS COUNTRY WORK. 2IQ 
A twenty-four inch gauge track, laid with thirty 
pound rails, can be put down under favorable circum- 
stances for about $3500 per mile. Then comes the bond- 
ing and the erection of the overhead structure. The 
amount of wire required for such a line is comparatively 
small, for the power also is small. 
For a line ten miles in length, two trains in steady 
service, each consisting of a light motor car and a freight 
skip, would meet all ordinary requirements. The total 
weight, loaded, should not often exceed ten tons. To drag 
this load on a level track at eight miles per hour requires 
about seven horse power at the car wheels. As grades 
would naturally be taken at a somewhat lower speed, the 
power required would not increase very greatly, and an 
expenditure of fifteen horse power at the wheels would 
seldom have to be exceeded. 
  
B D Street Ry.Journal 
RO 11 
In reckoning the copper we should have to allow for 
the delivery of about thirty amperes to the train. With 
600 volts initial pressure, and allowing one hundred volts 
drop at the end of the line, it appears that the copper re- 
quired is trifling. Using 13 as the constant in our stock 
formula, the wire, supposing the station to be at the cen- 
ter of the line, comes out No. o, which may conveniently 
be suspended as the trolley wire. 
For economy bracket construction should be used, 
unless circumstances require cross suspension, in which 
case the very neat diagonal suspension, due to J. C. Henry, 
is the cheapest and most convenient method for light 
work. ‘Thisis showninFig.113. Here A, B, C, D, E, etc., 
are the poles set in the usual way, 100 to 125 ft. apart, but 
alternately on either side of the track. The suspension 
wire is strung from pole to pole, as shown, and the trolley