. Railway and locomotive engineering : a practical journal of railway motive power and rolling stock . he automaticand the interlocking, used on the samerailroad have, nevertheless, an element 3!inconsistency about them which the Rail-way Signal Association seem to be de-sirous of eliminating. One may imaginethe automatic family of signals insistingthat a red light can only be obeyed by astop, and the interlocked system contend-ing that with more than one route at itsdisposal, a partnership of red lights is de-sirable where the permission to proceedis given by a change of one of theni andthe f
. Railway and locomotive engineering : a practical journal of railway motive power and rolling stock . he automaticand the interlocking, used on the samerailroad have, nevertheless, an element 3!inconsistency about them which the Rail-way Signal Association seem to be de-sirous of eliminating. One may imaginethe automatic family of signals insistingthat a red light can only be obeyed by astop, and the interlocked system contend-ing that with more than one route at itsdisposal, a partnership of red lights is de-sirable where the permission to proceedis given by a change of one of theni andthe forbidden route is barred by the otherlight remaining red. One of the systems discussed at theChicago meeting seeks to produce a uni-form system by applying the interlockingprinciple to automatic signals. This sys-tem makes use of the three-position, upperquadrant signal, and with this arrange-ment an interlocking home signal post liasthree arms on it, the upper one for thehigh-speed route, the second for thelimited speed or diverging route, and thedwarf signal below for slow speed, or GPEEN YlLLOW. AUTOMATIC. PROCEED. ONE BLOCKAHEAD CLEAR. NO RED LIGHTS. drilling movements. At night three redlights show in a vertical line when allthe routes are blocked. When one of tharoutes is set up the light for that routechanges from red to green or yellow ac-cording to whether two or one blockahead is unoccupied. The lights of tlie May, 1909. RAILWAY AND LOCOMOTIVE ENGINEERING 191 other routes not to be taken by the tramshow rci. In the application of this principle tothe automatic system, one upper quadrantthree-position signal is used. Accordingas green, yellow or red appears the en-ginemen know that they have in front ;if CRtEN RED
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