Railway Construction

John Stuart Mill · en
-----------------------+-------------------------+-------------------------
                         |   PASSENGER ENGINE.     |      GOODS ENGINE.
                         |                         |
                         |Six wheels, driving      |Six wheels, all coupled,
                         | and trailing wheels     | 4 ft. 6 ins. diameter.
                         | coupled, 6 ft. 6 ins.   | Cylinders,
                         | diameter. Cylinders,    | 17 ft. × 24 ft.
                         | 17 ft. × 24 ft.         | Locked-down pressure on
                         | Locked-down pressure on | safety-valves, 140 lbs.
                         | safety-valves, 140 lbs. | per square inch. Assumed
                         | per square inch. Assumed| pressure at cylinders,
                         | pressure at cylinders,  | 120 lbs. per square inch.
                         | 120 lbs. per square     |
                         | inch.                   |
                         |                         |
                         |Weight of engine 39 tons.|Weight of engine 34 tons.
                         |  ”       tender 24  ”   |  ”       tender 24  ”
                         |                 --      |                 --
                         |                 63  ”   |                 58  ”
  -----------------------+-----+-----+------+------+-----+-----+------+------
  Assumed cut-off        |  ¼  |  ⅓  |  ½   |  ¾   |  ¼  |  ⅓ |   ½  | ¾
      ”   mean effective |     |     |      |      |     |     |      |
           pressure, lbs.|  45 |  56 |  76  | 100  |  45 |  56 |  76  | 100
      ”   tractive force,|     |     |      |      |     |     |      |
           lbs.          | 4000| 4979| 6758 | 8892 | 5780| 7192| 9760 | 12844
  Speed in miles per hour|  60 |  40 |  30  |  15  |  40 |  30 |  20  |  15
                         |     |     |      |      |     |     |      |
                         |Tons.|Tons.|Tons. |Tons. |Tons.|Tons.|Tons. |Tons.
                         |     |     |      |      |     |     |      |
  Level                  |  97 | 230 | 447  | 892  | 213 | 358 | 623  | 907
  1 in 1000              |  84 | 196 | 373  | 707  | 187 | 310 | 532  | 768
    ”   800              |  81 | 188 | 358  | 671  | 181 | 299 | 512  | 739
    ”   600              |  76 | 177 | 335  | 618  | 172 | 285 | 482  | 695
    ”   400              |  68 | 157 | 296  | 533  | 157 | 257 | 432  | 621
    ”   300              |  60 | 141 | 263  | 467  | 143 | 233 | 390  | 560
    ”   250              |  55 | 129 | 241  | 424  | 133 | 216 | 361  | 519
    ”   200              |  47 | 114 | 213  | 372  | 120 | 195 | 324  | 467
    ”   150              |  37 |  93 | 177  | 304  | 101 | 165 | 276  | 397
    ”   100              |  21 |  63 | 126  | 217  |  74 | 123 | 208  | 302
    ”    90              |  -- |  56 | 114  | 197  |  -- | 113 | 191  | 279
    ”    80              |  -- |  48 | 101  | 175  |  -- | 101 | 172  | 253