Peabody Coal company, largest United States coal miner, has expanded its Arizona strip mining operations to supply 27,000 tons of coal per week to a new electric power generation plant. The bituminous, 11,000 BTU per pound coal has an ash content of 8.0 percent and a sulphur content of only 0.5 percent to make it ideal for steam generation. Coal from the new No. 2 mine rides to the Navajo Generating Station over a new conveyor belt and a 78-mile-long electrified and automated railroad. Coal is loaded into 122-ton capacity hopper cars near the mine and transported 78 miles by the Black Mesa and Lake Powell Railroad. International Engineering Company, Inc., of San Francisco, California, designed the railroad to use a highly efficient 50-kilovolt alternating-current power system which uses twice the voltage of any previous railroad system. Because of the high voltage, the system required only one power substation, which was much cheaper than the three or four that would ordinarily have been needed. The design also permitted IECO to use a lightweight catenary system to transmit current to the locomotives, which also saved money. Three new electric locomotives, each of 6,000 rail-rated horsepower, were manufactured by General Electric to pull the 83-car train along the new line's standard-gauge tracks, from 35 to 55 miles per hour.

  • Corporate Authors:

    Miller Freeman Publications, Incorporated

    500 Howard Street
    San Francisco, CA  United States  94105
  • Publication Date: 1974-6

Media Info

Subject/Index Terms

Filing Info

  • Accession Number: 00071804
  • Record Type: Publication
  • Source Agency: Engineering Index
  • Files: TRIS
  • Created Date: Nov 20 1974 12:00AM