62 ENGINEERING EEPOETS. 
• 
which could be brought upon cars from some point on or near 
the road, might be put up without interfering with the regular 
trains. For the loss by delay, and loss of interest on the origi- 
nal investment, certainly makes it for the interest of the com- 
pany to get their road into operation as soon as possible ; and 
if it can be done any sooner by putting up temporary works 
at some points, so that the permanent ones may be built after 
the road is in operation, and at an expense sufficiently cheap to 
justify the building of these temporary works, it certainly seems 
proper that it should be done. 
Estimate from Mina-titlan to the Jaltepec. 
In order to arrive at a safe estimate of the cost of this portion 
of the road, which I have called the first division, I have esti- 
mated one mile of the most difficult part, next to the Jaltepec, 
and taken it as an average of the whole, with the following 
result. 
Clearing, grubbing, earth-work, masonry and bridging, 
per mile, including the crossing of the Jaltepec River, $19,043 
Or sixty-two miles at $19,043 $1,180,666 
In the same way I have estimated that portion of the road 
from the foot of the Pass, over the Pacific plains, to Yentosa, 
as follows : 
FIFTH DIVISION. 
Clearing and grubbing, earth-work, masonry and bridg- 
ing, per mile, including the crossing of the Los Per- 
ros and Tehuantepec rivers, $9,880.56 
From Rancho de la Martar to Ventosa, via Tehuante- 
pec— thirty-five miles at $9,880.56, ' $345,819.60 
