. Railway and locomotive engineering : a practical journal of railway motive power and rolling stock . ample, suppose engine No. push button 21. In the experimentsthe holding of push button and theblowing of the warning whistle when outof the electric zone were arranged for a- not p. c lUSe .Hill: ivance. Ihe engine is now under control ofthe wave, and as long as the wave isin. received master relay 15 will beopened and closed every three seconds,econds closed and | , second open;consequently relay 3 and its trailing re-lays 4 to 12 remain closed. The waveis being received from the generator a
. Railway and locomotive engineering : a practical journal of railway motive power and rolling stock . ample, suppose engine No. push button 21. In the experimentsthe holding of push button and theblowing of the warning whistle when outof the electric zone were arranged for a- not p. c lUSe .Hill: ivance. Ihe engine is now under control ofthe wave, and as long as the wave isin. received master relay 15 will beopened and closed every three seconds,econds closed and | , second open;consequently relay 3 and its trailing re-lays 4 to 12 remain closed. The waveis being received from the generator atLansdowne avenue, the generator inturn being controlled by the alternatingcurrent track circuits being fed fromilo Golden avenue block station. Suppose there is a train standing inthe block between, say, Wallace ave-nue and Golden avenue. The wheelsof the train -hut off the current fromA. C. relay at Golden avenue, stoppingthe wave between Golden avenue andLansdowne avenue, the coherer failsto receive the wave, the master relayremains open, in one second relay 3opens and relays 4, 5, 6 and 7 open. TRA: A. WAVE WIRE IX CENTRE, WD PICK UP \l END H TIMS. 79S lea on its trip to \\ est to fi ii ha- its solenoid, co- herer. 16 and 17. in operation. Therebeing no electric wave between Simcoestreet and farkdalc, master relay relay 3 to 12, solenoids 13 and 14,are di d, whistle 20 i- blow- ing. Train line valve is held closed bypush buttin 21 to keep brakes wave zone just west of theQueen street subway, if the block isipnil. pick-up wave wire is un-:.d and the wave jumps to thepick-up antennae, the wave reaching thecoherer through it- contact on relay 15, which closesrelays .; to 12. The coherer thus beingautomatically connected with main an-tenna- under the engine, solenoid 13stops the whistle from blowing, sole-noid 14 closes valve 18 and the engi-neer can then remove hi- linger from successively, each a second later thanits predecessor, and in five
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