. Book of the Royal blue . ample:Roval. exactly the position of the niovmg ti\in the yard. This diagram is the large\er built and is nineteen feet sixinches long by five feet four andthree-quarter inches high and nineinches deep, containing 750 lampsand repeats 130 tracksections. Thefront of the diagram is glass, paintedflat black, except for the long slotsrepresenting the tracks. Back ofthese slots are small one-candle-power lamps, which burn continu-ously, except when they are turnedoff automatically by the train whichenters the section of track corre-sponding to the section in diagram,indic
. Book of the Royal blue . ample:Roval. exactly the position of the niovmg ti\in the yard. This diagram is the large\er built and is nineteen feet sixinches long by five feet four andthree-quarter inches high and nineinches deep, containing 750 lampsand repeats 130 tracksections. Thefront of the diagram is glass, paintedflat black, except for the long slotsrepresenting the tracks. Back ofthese slots are small one-candle-power lamps, which burn continu-ously, except when they are turnedoff automatically by the train whichenters the section of track corre-sponding to the section in diagram,indicating by the action of the lightsexactly the portions of the tracks onwhich trains are running; for ex- B. .V (), train 524, l-heLimited, leaves Washington forNew York on track No. ]^. Thes?nall lights back of the slot corre-sponding with track No. li on thediagram go out in each section ofthat track in the diagram passed overby the train, indicating its movementuntil it has left the territory coveredby the signal system. Another
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Keywords: ., bookauthorbaltimoreandohiorailr, bookcentury1800, bookdecade1890
