. Railway and locomotive engineering : a practical journal of railway motive power and rolling stock . lengtliof a block, is to guard against the resultof a break-in-two. Some installations usea track circuit at the end of each block,perhaps a couple of rails in length andthough this arrangement would drop theTrain in Block to Free, yet the rearcar or cars, if left in the middle of ablock by accident, would not prevent theclearing of the signal at the entrance ofthe block. The signalmans duty is in anycase to observe the markers. An elec-tric slot may be used with only the firstshort track cir
. Railway and locomotive engineering : a practical journal of railway motive power and rolling stock . lengtliof a block, is to guard against the resultof a break-in-two. Some installations usea track circuit at the end of each block,perhaps a couple of rails in length andthough this arrangement would drop theTrain in Block to Free, yet the rearcar or cars, if left in the middle of ablock by accident, would not prevent theclearing of the signal at the entrance ofthe block. The signalmans duty is in anycase to observe the markers. An elec-tric slot may be used with only the firstshort track circuit in a series of is a device carried on the signal postwhich automatically releases the sema-phore arm, allowing it to go to the hori-zontal position, in case the operatorshould omit to do so. He is the only block and proceed to tower B, and so onthrough each block. The advantages which are claimedfor this system of controlled manualare: First, that the power required tooperate the signals is, as a general rule,supplied by non-mechanical means. Inother words, a man usually pulls the. TYPICAL SIGNAL BRIDCE ON THE NEWYORK CENTRAL RAILROAD. signals to clear and puts them backto the horizontal position. Second, thattwo men are compelled to work in con-cert and, under all the circumstances,the chances of mistakes are materiallyreduced. Third, that the man who isin the best position to know whether atrain has passed out of a block or not. the train at Bs southbound home sig-nal would rest upon Cs , there is always the knowledgepossessed by the men on the enginethat any attempt to run past a homesignal commanding stop would bedetected and reported by the signalmanwhose semaphore indication had beendisregarded. There are one or two regulations inforce on the New York Central in con-nection with this system which have ab-solute safety for their object. Each sig-nalman records in a book, providedfor the purpose, the time the signalmanin the block next ahead
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