Railway Construction. William Hemingway Mills
| Passenger Engine. Six wheels, driving and trailing wheels coupled, 6 ft. 6 ins. diameter. Cylinders, 17 ft. × 24 ft. Locked-down pressure on safety-valves, 140 lbs. per square inch. Assumed pressure at cylinders, 120 lbs. per square inch. Weight of engine 39 tons. ” tender 24 tons. 0000000000000 63 tons. | ||||
| Assumed cut-off | ¼ | ⅓ | ½ | ¾ |
| ” mean effective pressure, lbs. | 45 | 56 | 76 | 100 |
| ” tractive force, lbs. | 4000 | 4979 | 6758 | 8892 |
| Speed in miles per hour | 60 | 40 | 30 | 15 |
| Tons. | Tons. | Tons. | Tons. | |
| Level | 97 | 230 | 447 | 892 |
| 1 in 1000 | 84 | 196 | 373 | 707 |
| ” 800 | 81 | 188 | 358 | 671 |
| ” 600 | 76 | 177 | 335 | 618 |
| ” 400 | 68 | 157 | 296 | 533 |
| ” 300 | 60 | 141 | 263 | 467 |
| ” 250 | 55 | 129 | 241 | 424 |
| ” 200 | 47 | 114 | 213 | 372 |
| ” 150 | 37 | 93 | 177 | 304 |
| ” 100 | 21 | 63 | 126 | 217 |
| ” 90 | — | 56 | 114 | 197 |
| ” 80 | — | 48 | 101 | 175 |
| ” 75 | — | 43 | 94 | 164 |
| ” 70 | — | 39 | 86 | 152 |
| ” 60 | — | 28 | 70 | 128 |
| ” 50 | — | — | 53 | 101 |
| ” 40 | — | — | — | 73 |
| ” 25 | — | — | — | 27 |
| Goods Engine. Six wheels, all coupled, 4 ft. 6 ins. diameter. Cylinders, 17 ft. × 24 ft. Locked-down pressure on safety-valves, 140 lbs. per square inch. Assumed pressure at cylinders, 120 lbs. per square inch. Weight of engine 34 tons. ” tender 24 tons. 0000000000000 58 tons. | ||||
| Assumed cut-off | ¼ | ⅓ | ½ | ¾ |
| ” mean effective pressure, lbs. | 45 | 56 |
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