The transition to haulage of taconite pellets on the Duluth, Missabe & Iron Range Railway found unit train services attractive. To achieve optimum train operation, DM&IR coupled its short ore cars in four-car sets with drawbars, introduced the Wabco straight-air retainer system, and eliminated angle-cocks and air-hose connectors where the drawbars are installed. The road uses a planned 1,188 cars assembled in "miniquads" in 124-car unit trains. With this operation so successful, attention has now turned to on-train monitoring of derailed equipment and plans for a more comprehensive real-time measurement of condition throughout any unit train. It is concluded that more can be done to improve the operational control, efficiency and safety of unit trains.

Media Info

  • Features: Figures;
  • Pagination: p. 78-84

Subject/Index Terms

Filing Info

  • Accession Number: 00097312
  • Record Type: Publication
  • Source Agency: Federal Railroad Administration
  • Files: TRIS, USDOT
  • Created Date: Aug 13 1976 12:00AM