. Railway track and track work . Fig. 64.—Movable-Point Crossing. Fig. 62.—Frog Substitutes. Crossing Frogs.—Where two tracks intersect (as at grade crossings), crossingfrogs must be used to give a flangeway in both directions, and as there is nouniformity in the angles, the crossings have generally to be specially made foreach case. They are built up of rails bolted together, with filling pieces betweenand heavy connections in the angles. They should be riveted to base plates atthe corners or extending continuously under the rails. The rail ends may bebeveled off to a miter joint at the frog
. Railway track and track work . Fig. 64.—Movable-Point Crossing. Fig. 62.—Frog Substitutes. Crossing Frogs.—Where two tracks intersect (as at grade crossings), crossingfrogs must be used to give a flangeway in both directions, and as there is nouniformity in the angles, the crossings have generally to be specially made foreach case. They are built up of rails bolted together, with filling pieces betweenand heavy connections in the angles. They should be riveted to base plates atthe corners or extending continuously under the rails. The rail ends may bebeveled off to a miter joint at the frog point, or have one rail butted against theother. The inner wing rail, or guard rail, is usually continuous in crossings of45° to 90°, but is sometimes stopped and flared out at each corner. Bothmethods are shown in Fig. 63. (See also Grade Crossings.) Where one trackis the more important its rails may be continuous, having the heads grooved SWITCHES AND FROGS. 127 to form flangeways for wheels crossing them. At crossings
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