136 ELECTRO-PNEUMATIC SWITCHING AND SIGNALING SYSTEM AT THE SOUTH BOSTON TERMINAL STATION. MARCH 3 1900. BOSTON TERMINAL YARD SHOWING DIAMOND CROSSINGS AND SWITCHES AND ONE OF THE SIGNAL BRIDGES REAR VIEW SHOWING_ROTATING SHAFTS ELECTRO-MAGNETS AND INTERLOCKING BARS. SFRONT VIEW OF ELECTRIC INTERLOCKING MACHINE MOWING OPERATING LEVERS AND WORKING MODEL OF YARD., scientific american, 1900-03-03
136 ELECTRO-PNEUMATIC SWITCHING AND SIGNALING SYSTEM AT THE SOUTH BOSTON TERMINAL STATION. MARCH 3 1900. BOSTON TERMINAL YARD SHOWING DIAMOND CROSSINGS AND SWITCHES AND ONE OF THE SIGNAL BRIDGES REAR VIEW SHOWING_ROTATING SHAFTS ELECTRO-MAGNETS AND INTERLOCKING BARS. SFRONT VIEW OF ELECTRIC INTERLOCKING MACHINE MOWING OPERATING LEVERS AND WORKING MODEL OF YARD., scientific american, 1900-03-03
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