. The Street railway journal . SIGNALS GOYERXIXG MILL V. NORTH PORTAL OF TUNNEL, SHOWING SIGNALS AND ALUMINUM FEEDERSGOING OVER HILL. SIGNAL VvIRE TRANSFORMER POLE AT LEFT \LLEY JUNCTION, AND INTERLOCKING TOWERAT RIGHT located in the depot at Sausalito, all despatch-ing being done by telegraph. For the use ofthe officers and operating men a telephonesystem connects the terminal shops, powerhouse and all suburban stations. An automatic block signal has been in-stalled by the Union Switch & Signal Com-pany for the double track between Sausalitoand San Anselmo. This system embodies cer-tain inter
. The Street railway journal . SIGNALS GOYERXIXG MILL V. NORTH PORTAL OF TUNNEL, SHOWING SIGNALS AND ALUMINUM FEEDERSGOING OVER HILL. SIGNAL VvIRE TRANSFORMER POLE AT LEFT \LLEY JUNCTION, AND INTERLOCKING TOWERAT RIGHT located in the depot at Sausalito, all despatch-ing being done by telegraph. For the use ofthe officers and operating men a telephonesystem connects the terminal shops, powerhouse and all suburban stations. An automatic block signal has been in-stalled by the Union Switch & Signal Com-pany for the double track between Sausalitoand San Anselmo. This system embodies cer-tain interesting features which are novel inthe art of railroad signaling, in that alternat-ing current is used in track circuits, which inturn actuate the motors that operate the sig-nals. Electric transportation having reachedthe speed and other conditions common tosteam practice, it follows that similar protec-tive devices are called for, but the customarytrack circuit supplied by a primary battery orother source of direct current, is in this caseproscrib
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectstreetr, bookyear1884
