N. B. The Boston and Albany has a double track for 201 miles. The New York Central has 515 miles of double track, 231 miles of third track, and 222 miles of fourth track, and 413 miles of side-track. The Erie Railway has 306 miles of double track, and 114 miles of third track, and 337 miles of side-track. The Pennsylvania Railroad has 355 miles of double track and 357 miles of third and fourth tracks and sidings. The Baltimore and Ohio Railroad has 362 miles of double track and 830 miles of third and fourth tracks and sidings.

Dunleith, Il

455.72

402. 16

1, 107.66

249.78

FORMULA FOR ASCERTAINING THE COST OF RAILROAD TRANSPORTATION PER TON PER MILE. BY ALBERT FINK, ESQ., OF LOUISVILLE, KY.

= a.

Showing, also, with reference to the items of expenditures before stated, the various elements entering into the calculation of cost. Movement-expenses per ton-mile: movement-expenses per train-mile, (items 41 to 58,) average number of tons of freight in each train cost of handling freight, (items 24 to 38,) at forwarding-station + at delivery-station length of haul

=b.

Station-expenses per ton-mile

Maintenance of road per ton mile=

100

Interest per ton-mile

cost of maintenance of road per mile per year, (items 1 to 23,) X total miles run by freight-trains per year total revenue-trains, passenger and freight, per year average number of tons of freight transported over one mile of road per year cost of road per mile X rate of interest per annum X. number of freight-train miles per year number of revenue-train miles, freight and passenger, per year average number of tons of freight transported over one mile of road per year

C.

= d.

In order to make use of this formula, it is necessary to know the fifty-eight items of expense enumerated before, all of which vary on different roads and enter into different combinations with each other. Some of the items of movement-expenses, (41 to 58,) change with the weight of trains, and have to be ascertained in each individual case. The average cost for the year can be made the basis of the estimate. Besides the items already shown, the following other items enter into the calculation: The average number of tons of freight in train per mile of the round trip of the train; the average length of the haul; the number of miles ruu over the road, with freight and passenger trains, per make a correct estimate of the cost of transportation on railroads. annum; the cost of the road; the rate of interest; and the total number of tons of freight carried during a year over one mile of road. Without these data it is impossible to