. Railway and locomotive engineering : a practical journal of railway motive power and rolling stock . eceof mechanism is moved with the ease andapparent simplicity of the hands of av<atch, although a weight of not less than758 tons swing upon the central the time the railway traffic is closed March, 1916. RAILWAY AND LOCOMOTIVE ENGINEERING. 75 til! the moment wlicii the waterway isopen for steamship traffic is a period ofonly seventy seconds. When the hridgeis open, not only do the interlockedsignals at the hridge indicate stop, butthe automatic block signals to which theyare co


. Railway and locomotive engineering : a practical journal of railway motive power and rolling stock . eceof mechanism is moved with the ease andapparent simplicity of the hands of av<atch, although a weight of not less than758 tons swing upon the central the time the railway traffic is closed March, 1916. RAILWAY AND LOCOMOTIVE ENGINEERING. 75 til! the moment wlicii the waterway isopen for steamship traffic is a period ofonly seventy seconds. When the hridgeis open, not only do the interlockedsignals at the hridge indicate stop, butthe automatic block signals to which theyare connected give a distinct indication to span at the south end of the bridge toaccommodate the existing roadway andadmit running of a possible railway trackalong the south canal bank. This spanweighs about 143 tons, making a totalof 758 tons for the whole electric operating power is carried bridge for canal traffic until all railwaytraffic is stopped at a safe distance fromthe bridge, THE ST. LAWRENCE RIVER BRIDGE. In regard to other important bridgework, the reconstruction of the St. Law-. THE C. P. U. BRIDGE AT EDMONTON, SHOWING DEVI.\TION OF HIGHWAY AT EACH END. an approaching train that they will find by submarine cables under the canal to the interlocked signals at stop whenthey are reached. This plate girder swing span is under-stood to be the longest plate girder spanof its kind ever built, being 239 feet 7 the centre pier, and there supplied toduplex 30 h. p. motors which are con-trolled from the operators house on thenorth bank of the canal, and, in addition,a spare 30 h. p. motor is kept on hand rcnce River bridge between Highlandsand Caughnawaga, about eight miles fromthe Montreal terminal, is a triumph of agreat work being accomplished withoutinterruption to traffic. The old single-track structure was replaced by two


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