. American engineer and railroad journal . ent arc lights, consequently a mercury con-verter was installed. There are two loops from the power sta- December, 1908 AMERICAN ENGINEER AND RAILROAD JOURNAL. 485 tion, one of which is for the Porl Huron lights and the otherfor the Sarnia lights. Dispatching.—The tunnel division is protected by a bloeksignal system which extends from summit to summit. The dis-patchers cabin is located at the Sarnia summit and the othersignal cabin at the Port Huron summit. Telegraph orders areused. In addition to the written order the conductor receives when
. American engineer and railroad journal . ent arc lights, consequently a mercury con-verter was installed. There are two loops from the power sta- December, 1908 AMERICAN ENGINEER AND RAILROAD JOURNAL. 485 tion, one of which is for the Porl Huron lights and the otherfor the Sarnia lights. Dispatching.—The tunnel division is protected by a bloeksignal system which extends from summit to summit. The dis-patchers cabin is located at the Sarnia summit and the othersignal cabin at the Port Huron summit. Telegraph orders areused. In addition to the written order the conductor receives when the train enters the block. The switches and signalsare locked until this staff is placed in the instrument at the otherend of the block. The protection is SO complete that not a singleaccident chargeable to dispatching has occurred during the eigh-teen years of tunnel service. There is a yard telephone systemand in addition a special telephone line connecting the powerstation, the two signal cabins at the two portals, the middle of the. SINGLE PHASE ELECTRICAL LOCOMOTIVE—ST. CLAIR TUNNEL CO. tunnel and the roundhouse. The dispatcher is the master of thesituation. He not only controls the train movements but the mo-tive power as well. Any failure of power is immediately reportedto him. In case it is trouble with a locomotive he has the enginereplaced. In case it is trouble with the distributing system heorders the power cut off, then communicates with the electricalsuperintendent who takes charge of the repairs. As soon as therepairs have been effected the dispatcher is advised and ordersthe power turned on again. He is also advised as to any powerstation trouble that will interfere with train movements. Thereis no division of responsibility. This arrangement is the logicalone, since it is the dispatchers business to get the trains throughthe tunnel. He must accordingly be supplied with the necessarymotive power and be kept advised as to its availability. Likewisein case of
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