====================+========+========+=======+=======+=======+===== A | B | C | D | E | F | G --------------------+--------+--------+-------+-------+-------+----- From Harrisburg | { 16 | | 346.6 | 207.9 | 0.534 | 1.87 to Lewistown, | { | | | | | 60-7/10 miles | { | 8 | 454.3 | 272.6 | 0.697 | 1.42 --------------------+--------+--------+-------+-------+-------+----- From Lewistown | { | | | | | to foot of | { 21 | | 300.7 | 180.4 | 0.464 | 2.15 Allegheny Mts., | { | 10½ | 414.6 | 248.8 | 0.640 | 1.56 72 miles | { | | | | | --------------------+--------+--------+-------+-------+-------+----- From foot to summit | { | | | | | of Allegheny | { 80 | | 105.6 | 63.4 | 0.163 | 6.13 Mountains, | { | Level | 648.0 | 388.8 | 1.000 | 1.00 12-3/10 miles | { | | | | | --------------------+--------+--------|-------+-------+-------+----- From summit to | { 47 | | 172.4 | 103.4 | 0.266 | 3.76 Pittsburg, 106 | { 50 | 50 | 163.7 | 98.2 | 0.252 | 3.95 miles | { 52.8 | 52.8 | 156.2 | 93.7 | 0.241 | 4.14 --------------------+--------+----------------+-------+------------- It will be perceived from the foregoing table that three locomotives are fully sufficient to transport the same load up the 80 feet gradient that two will carry on the gradient of the western division, and one on the eastern; hence the practical working of the road on the two methods of ascent would be to run two locomotives with the load brought from below from Logan's Narrows to the summit, say 31¾ miles, up the 50 feet gradient; while, on the other, the same engine that brought the load from Harrisburg would continue with it to Robinson's (15 miles), where it would accompany the two destined for Pittsburg to the summit of the mountain and return. In the first case the engines together will have traveled 63½ miles, and, in the other, the three 51¾, leaving a difference in distance to be traveled by the moving power due to each full train, from the east, 11¾ miles in favor of the 80 feet gradient.