+------+---------+-------+-------+------+-------+------+------+-----------+ |Miles |Ascending|Useful |Super- | Gross|Useful |Waste |Gross |Ratio of | |per |Gradient |Load | fluous| |Load |Horse-|Horse-|Horse-power| |Hour | |in tons|Load in| |in tons| power| power|Waste to | | | | | tons | | | | |Useful | | | | | | | | | |Horse-power| +------+---------+-------+-------+------+-------+------+------+-----------+ | {| 0 | 288 | 50 | 338 | 411 | 144 | 555 | ·35 | | {| 1/200 | 128 | 50 | 178 | 352 | 203 | 555 | ·58 | | {| 1/100 | 71 | 50 | 121 | 292 | 263 | 555 | ·90 | | 40 {| 1/75 | 50 | 50 | 100 | 252 | 303 | 555 | 1·20 | | {| 1/50 | 23·8 | 50 | 73·8| 173 | 382 | 555 | 2·21 | | {| 1/40 | 11·7 | 50 | 61·7| 113 | 442 | 555 | 3·91 | | {| 1/36·3 | 7 | 50 | 57 | 82 | 473 | 555 | 5·77 | | | | | | | | | | | | {| 0 | 139 | 50 | 189 | 504 | 280 | 784 | ·56 | | {| 1/200 | 68 | 50 | 118 | 415 | 369 | 784 | ·89 | | {| 1/100 | 35·7 | 50 | 85·7| 325 | 459 | 784 | 1·41 | |60 {| 1/75 | 22·5 | 50 | 72·5| 265 | 519 | 784 | 1·96 | | {| 1/52·3 | 7 | 50 | 57 | 160 | 624 | 784 | 3·90 | +------+---------+-------+-------+------+-------+------+------+-----------+ Thus, on a level line, the engine, working up to 555 horse-power, could just draw 288 tons of train at the rate of 40 miles per hour, wasting on its own resistance only one-third of the power usefully employed on the train; but when the speed was increased to 60 miles per hour, it could not, though working up to 784 horse-power, draw more than 139 tons of train, wasting on its own resistance more than half the power usefully employed on the train. And again, at 40 miles per hour, though, as just stated, it could draw on the level 288 tons, it could only draw 24 tons of useful load at that speed up 1 in 50; while at 60 miles per hour, though it could draw, as stated, 139 tons of train on the level, it could only draw 23 tons of useful load up 1 in 75; and at the respective speeds of 40 and 60 miles per hour, it could only take one carriage (7 tons) up the respective gradients of 1 in 36, and 1 in 52.