3,622 miles.
The total cost of these two roads. $331,492.59
Or an average per mile of 91.52
Total miles changed was about 14,500 miles.
Which would give total cost, at same rate. $1,327,040

We should really add to this a large sum for the great number of new
locomotives which were purchased to replace old ones, that could not
be changed, except at large cost, and which, when done, would have
been light and undesirable.

Upon the basis of the work done upon the L. & N. and E.T., V. & G.
systems, which, combined, cover about one-fourth the mileage changed,
we have made the following estimates, which will, perhaps, convey a
better idea of the extent of the work than can be obtained in any
other way:

Miles of track changed, about 14,500
Locomotives changed, about 1,800
Cars (pass, and freight) changed, about 45,000
New axles used, about 9,000
New wheels used, about 20,000
Axles turned back, about 75,000
Wheels pressed on without turning axles, about 220,000
New brasses used, about 90,000
Kegs of spikes used, about 50,000
Cost of material used, about $600,000
Cost of labor, about 730,000
Total cost of work, about 1,330,000
Amount expended on equipment, about 650,000
Amount expended on track, about 680,000
Amount expended on track on day of change in labor, about 140,000

The work was done economically, and so quietly that the public hardly
realized it was in progress. To the casual observer it was an every
day transaction. It was, however, a work of great magnitude, requiring
much thought and mechanical ability.

That it was ably handled is evidenced by the uniform success attained,
the prompt changing at the agreed time, and the trifling inconvenience
to the public.--_Jour. Assn. Engineering Societies._

* * * * *

TORPEDO BOATS FOR SPAIN.

In our present issue, on page 9948, we give illustrations of two
torpedo boats, the Az