. Railroad structures and estimates . parallel with the track instead of a horizontal plane. Inthis way danger to switchmen is reduced. Suntch Targets. — It is the practice to the single target orstands showing no signals for a clear track except by a light atnight. Enameled targets are used to a great extent as they retaintheir brightness longer than painted targets. The bulls-eye target with the light in the center is consideredgood practice for yard stands. It is usually not the practiceto use hghts or switch stands within 200 ft. of a use of a distinct color for the targ
. Railroad structures and estimates . parallel with the track instead of a horizontal plane. Inthis way danger to switchmen is reduced. Suntch Targets. — It is the practice to the single target orstands showing no signals for a clear track except by a light atnight. Enameled targets are used to a great extent as they retaintheir brightness longer than painted targets. The bulls-eye target with the light in the center is consideredgood practice for yard stands. It is usually not the practiceto use hghts or switch stands within 200 ft. of a use of a distinct color for the targets of secondary switchesis quite common, yellow being the color usually adopted. Frogs. — The frog is a device whereby the rail at the turnoutcurve crosses the main track rail, and is represented by Fig. 66b,with all the parts designated in the terms generally Foot guards are inserted in the angle of frogs, heel of switchesand ends of guard rails to protect employees from getting theirfeet caught. 220 PROPERTIES OF Fig. 66b. The frog number is the proportion of its length into its breadthor spread. Frog angle — ch -=r {ah + cd).
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Keywords: ., bookcentury1900, bookdecade1910, bookidrailroadstructur00orrouof
