. Railway and locomotive engineering : a practical journal of railway motive power and rolling stock . clear, theswitch indicator is clear , however, a train enters theblock next behind, a red diskswings into the little circular open-ing of the indicator and remains thereuntil the block in which the switch issituated has been vacated by the latest form of this signal made bythe Union Switch & Signal Co. and theHall Signal Co., show a miniature sem-aphore with one arm. It is evident, January, 1904. RAILWAY AND LOCOMOTIVE ENGINEERING therefore, tliat a switch cannot be open-ed
. Railway and locomotive engineering : a practical journal of railway motive power and rolling stock . clear, theswitch indicator is clear , however, a train enters theblock next behind, a red diskswings into the little circular open-ing of the indicator and remains thereuntil the block in which the switch issituated has been vacated by the latest form of this signal made bythe Union Switch & Signal Co. and theHall Signal Co., show a miniature sem-aphore with one arm. It is evident, January, 1904. RAILWAY AND LOCOMOTIVE ENGINEERING therefore, tliat a switch cannot be open-ed without warning both main lines,and also the approach of a train is madeto inform anyone seeking to open amain-line switch as to whether lie maydo so with safety or not. In operating a siding switch within ablock, a modification of the same prin- the clearance point, because the trainon the siding is then in the positionwhich is described in the language ofthe road as being in to clear. THE BLACK AUTOMATIC MECHANICALSIGNAL. A simple form of automatic blocksignal operated by the moving train,. SWITCH STAND AND TARGET WITH SWITCH INDICATOR BESIDE IT. TRACKINSULATION SHOWN AT END OF BLOCK. ciple is brought into play. The open-ing of the switch at once gives thestop with both arms horizontal onthe nearby signal post, and the cau-tion on the post of the block nextbehind, which shows the break in thecontinuity of the one main line, andwarns and halts a train in due time. One of the dangers in using a sid-ing is that until the train is well in onthe siding and the switch closed, themain line is practically occupied. It ispossible to close the switch and yethave the last car of the train overhangthe main line. The point where a carpartly in on the siding would just bestruck by a passing main-line train isthe fouling point of the tracks, andall possible danger is avoided by car-rying the track circuit up along the sid-ing rails a suitable distance beyondthe fouling point, so that even
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