| A route, A B c. | B route, A M K c. | |
|---|---|---|
| Length, | 39.29 | 43.58 |
| Rise A to c, | 540.00 | 1087.00 |
| Rise c to A, | 395.00 | 936.00 |
| Whole rise and fall, | 935.00 | 2023.00 |
| Degrees of curvature, | 2371°.00 | 3253°.00 |
| Estimated cost, | $746,900.00 | $628,600.00 |
Assuming the number by which to equate for grades, as 96, and the equating number of degrees of curvature as 1140°; equating for grades and curvature in both directions, we have,
| Route A. A to c. | Mean, 46.25. | ||
| 39.29 + | 540 96 + 2371 1140 = 39.29 + | 5.63 + 2.08 = 47.00 | |
| Route A. c to A. | |||
| 39.29 + | 395 96 + 2371 1140 = 39.29 + | 4.12 + 2.08 = 45.49 | |
| Route B. A to c. | Mean, 56.96. | ||
| 43.58 + | 1087 96 + 3253 1140 = 43.58 + | 11.32 + 2.85 = 57.75 | |
| Route B. c to A. | |||
| 43.58 + | 936 96 + 3253 1140 = 43.58 + | 9.75 + 2.85 = 56.18 | |
Assuming the cost of working and of maintaining as $4,000 per mile, we have
The cost of building A to B as $746,900 to $628,600
The cost of operating A to B as (46.25 × 4000) × 100
6 to (56.96 × 4000) × 100
6,
| or as | $3,083,334 | to | $3,797,334 |
| and the sum as | $3,830,234 | $4,425,934 |
giving the preference of $595,700 to the route A B c, notwithstanding that the estimate thereon exceeds that on B by $118,300. The route A B c was adopted.
Again, it was doubtful whether to adopt the route E F, in going from D to G, or the line I H. The following are the elements of the two lines:—
| I H. | E F. | |
|---|---|---|
| Measured length, | 61.14 | 58.53 |
| Rise D to G, | 1187 | 454 |
| Rise G to D, | 1049 | 316 |
| Degrees curve, | 7609° | 4588° |
| Estimated cost, | $1,094,950 | $1,496,430 |