. Electric railway journal . Mesaba Railway—Exterior of Chisholm Substation home and distant rails protecting each siding. Thethird-rail locations were also selected with a view toeliminating difficulties which might arise through drift-ing snow. The method of installing the third-rails con-forms to the standards employed on the Indianapolis &Cincinnati Traction line, as well as the Nashville-Galla-tin Interurban line. Certain refinements in the opera-tion of this signal system, however, have been included. Probably the most important of these additions to thesystem is the directional movement
. Electric railway journal . Mesaba Railway—Exterior of Chisholm Substation home and distant rails protecting each siding. Thethird-rail locations were also selected with a view toeliminating difficulties which might arise through drift-ing snow. The method of installing the third-rails con-forms to the standards employed on the Indianapolis &Cincinnati Traction line, as well as the Nashville-Galla-tin Interurban line. Certain refinements in the opera-tion of this signal system, however, have been included. Probably the most important of these additions to thesystem is the directional movement protection, which is. Mesaba Railway—Motor-Generator Sets in ChisholmSubstation essentially as follows: When a west-bound train isabout to take possession of the block the circuits arearranged so that an east-bound train receives a redlight if it attempts to oppose the west-bound train inthe same block. Each block may be set for either aneast or west-bound movement, but the moment it is set for one the other is disengaged. This might be accom-plished in the usual way—that is, by two separatelycontrolled circuits—but the Simmen system accom-plishes the east-bound and west-bound control over asingle wire. The principal features of this arrange-ment include three phases of control. One gives a greenlight to an east-bound movement by energizing a third-rail positive, another gives a west-bound movement aclear light by energizing the third-rail negative, and astop indication is given to each by totally de-energizingthe rail. In further explanation of this feature, suppose thatall east-bound movements requ
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