. A report on the alternating current, single phase, interurban railway line between Bloomington and Peoria . from awatchmans tower on the center pier. The structure is builtentirely of steel and rests on concrete piers. Figure two showsa view of the draw span of this bridge. The only other steel bridge is the one over the MackinawRiver. It is of one span, built on concrete end piers. The right of way is 82-l/2 feet in width at all pointsexcept where the line operates under franchise in city maximum curvature is two degrees and the maximum gradientis 4 TRACK CONSTRUCTION. The
. A report on the alternating current, single phase, interurban railway line between Bloomington and Peoria . from awatchmans tower on the center pier. The structure is builtentirely of steel and rests on concrete piers. Figure two showsa view of the draw span of this bridge. The only other steel bridge is the one over the MackinawRiver. It is of one span, built on concrete end piers. The right of way is 82-l/2 feet in width at all pointsexcept where the line operates under franchise in city maximum curvature is two degrees and the maximum gradientis 4 TRACK CONSTRUCTION. The track is composed of 70# rail, 3o* in length,joined together with continuous rail joints and laid on stand-ard railroad ties, two foot centers. The bonding is of 10Figure 8, 7/8 terminal lug bond, compress d into the web ofthe rail with compressor. The line is ballasted with gravelfrom six to ten inches under the tie. On the hill coming outof the Illinois River bottoms the south rail is insulated withWebber Rail Joints, in order that the rail may be used with theblock signals which are described -6- At the various steam road crossings there are handde-rails which must he held closed while the cars are passing. IV. LINE CONSTRUCTION. The catenary type of construction is \ised, which con-sists of a 7/l6w galvanized iron strand messenger wire, and a000 grooved trolley wire. The trolley wire is suspended fromthe messenger by three suspension hangers, two of which are18 long, and one called the center point hanger, which fastensthe trolley to the messenger about l-l/2 apart. The mast arms are of the tube type, made of 2-l/2wsteel tubes, and it is from these that the above constructionis suspended, insulated with Thomas 3,300 volt insulators. Where the line passes through a town the nine pointsuspension is used, that is, there are nine hangers instead ofthree. This is to prevent the line coming to the ground in caseof a break. There is a guy or anchor placed every one halfmi
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