. Electric railway journal . Mesaba Railway—Cross-Section of Chisholm Substation tected by making all west-bound movements clear witha negative current. Hence, if a west-bound train passesa positively energized rail, it receives a red indication. The operating advantages of this arrangement arethat the east-bound train may take a siding, and in casethere are two or more sections of the west-bound train,the east-bound train must be in the clear before thewest-bound train can receive a proceed signal. If allrails are negatively energized—that is, if they are pro-viding a clearance signal for wes
. Electric railway journal . Mesaba Railway—Cross-Section of Chisholm Substation tected by making all west-bound movements clear witha negative current. Hence, if a west-bound train passesa positively energized rail, it receives a red indication. The operating advantages of this arrangement arethat the east-bound train may take a siding, and in casethere are two or more sections of the west-bound train,the east-bound train must be in the clear before thewest-bound train can receive a proceed signal. If allrails are negatively energized—that is, if they are pro-viding a clearance signal for west-bound trains—the. Mesaba Railway—Switchboard and Transformer Sectionof Chisholm Substation east-bound car is held at that siding until all the sec-tions of the west-bound train have passed, and it can-not leave until the dispatcher changes the levers andpositively energizes the rail. The added cost of this construction over the simpleform of control, such as is used on the Toronto & York January 10, 1914.] ELECTRIC RAILWAY JOURNAL 73 Radial Railway, is practically negligible. The principaladdition necessary in the installation is the additionalbatteries in the dispatchers office. These two batteriesare arranged with one positive to ground and the othernegative to ground. To obtain the advantage of thedirectional indications, it is also necessary to changethe ordinary relay on the car to a polarized relay andinstall a directional switch. In actual practice it has been found that the propul-sion current, which is positive to trolley and negative totrack, tends to go through the signal circuits. Acc
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