. Electric railway journal . FIG. 5 B. R. T. STANDARD TRACK LAYOUT WITHOUT CAR CLEARANCEFOR ACUTE ANGLED INTERSECTINGSTREETS 40 FT. WIDE Fig. 1 that because of the length of the straight armof the tongue switches only one joint is required be-tween the P. F. and the P. T. Better repairs can bemade to this joint than when the arm is near the heelof the switch tongue. All exterior arms of frogs are 5 ft. long. All crossovers are of one standard design, the engi-neering data for which are shown in Fig. 4. Two. FIG. 3—B. R. T. STANDARD TRACK LAYOUTS SHOWING THREE DESIGNS WITH CAR CLEARANCE FOR TWO
. Electric railway journal . FIG. 5 B. R. T. STANDARD TRACK LAYOUT WITHOUT CAR CLEARANCEFOR ACUTE ANGLED INTERSECTINGSTREETS 40 FT. WIDE Fig. 1 that because of the length of the straight armof the tongue switches only one joint is required be-tween the P. F. and the P. T. Better repairs can bemade to this joint than when the arm is near the heelof the switch tongue. All exterior arms of frogs are 5 ft. long. All crossovers are of one standard design, the engi-neering data for which are shown in Fig. 4. Two. FIG. 3—B. R. T. STANDARD TRACK LAYOUTS SHOWING THREE DESIGNS WITH CAR CLEARANCE FOR TWO INTERSECTING ROADWAYSEACH 40 FT. WIDE, ONE 30 FT. AND THE OTHER 40 FT. WIDE, AND FOR ONE ACUTE ANGLED LAYOUT RESPECTIVELY 150 ELECTRIC RAILWAY JOURNAL [Vol. XLVIII, No. 4 different types of frogs are used. For terminal cross-overs standard hard-center construction is used,whereas for emergency crossovers the frogs are eitherof bolted type or of cast-in (jump) type, with thethrough run on the straight. No hard center is usedin the latter type. By the adoption of standard designs the cost of plansof special work layouts is reduced to a minimum; com-parison of the various designs with the survey of physi-cal conditions at the location in question will enable adraftsman to determine the best design in a very shorttime; should changes be found necessary these areeasily made in the plain ends of the layout. By makinginterchangeability of parts possible, a layout boughtfor one location may often be used
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