. Elektrische Eisenbahn Zeitschrift . IMPEDANZBINDUNG MIT SCHUTZABDECKUNG ENTWICKELT, UM zwei TIES durch die Bitter Root und Big Belt Mountains in Montana und Idaho FITBETWEEN. Stahlbinder im flachen Straßenbett die nebenstehende Abbildung zeigt die Installation der Gleise der Mahoning & Shenango Railway & LightCompany auf der neuen Betonbogenbrücke über den Mahoning River in Warren, Ohio. Dies ist ein anderes Beispiel, in dem International Twin Stahlbinder auf einer Betonbrücke verwendet wurden, wo der Abstand zwischen der Basis der Schiene und dem Betonboden der Brücke klein ist. Wie in der Illustration gezeigt

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. Electric railway journal . IMPEDANCE BOND WITH PROTECTING COVER DESIGNED TO FITBETWEEN TWO TIES through the Bitter Root and Big Belt Mountains inMontana and Idaho. Steel Ties Used in Shallow Roadbed The accompanying illustration shows the installationof track of the Mahoning & Shenango Railway & LightCompany on the new concrete arch bridge across theMahoning River at Warren, Ohio. This is anotherinstance in which International twin steel ties have beenused on a concrete bridge where the clearance betweenthe base of rail and the concrete floor of the bridge issmall. As shown in the illustration, the top and sidesof the track trench are painted with a heavy tar prepa-ration, so that the track construction can be renewedat the end of its life without disturbing the bridge floor. The first large installation in which the steel twinties were placed on concrete bridge floors was the con-. TRACK INSTALLATION ON CONCRETE BRIDGE, WARREN, OHIO struction of the track on the Brooklyn-Brighton Bridgeat Cleveland, Ohio, described in the Electric RailwayJournal for Oct. 16, 1915, page 834. Here the clear-ance under the rail was only 4 in. Since then there havebeen many instances in which engineers have used theshallow steel ties for locations having limited clearance. Trie Kansas City Railways mechanical departmentwelds all its broken motor frames by the thermitprocess. Although it is somewhat more expensive thanother welding processes that could be employed, thethermit furnishes a much stronger weld, at least onehas never been broken in service, and it is possible toreinforce the motor frame wherever this is required. 544 ELECTRIC RAILWAY JOURNAL [VOL. XLVIII, No. 13

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