. Railway track and track work . about 10 x 16ins., which has lugs to limit the throw and is also formed to hold the endsof the stub rails and keep them from creeping. These rails should also bebolted together, a filler block being placed between the webs, and sometimesa U strap is bolted around the ends of the webs. Cast iron is liable to frac-ture, and wrought iron or cast steel are preferable, the base plate beingabout 1 in. thick. The head chairs are spiked to a heavy timber head blockabout 8 x 12 ins., 12 to 16 ft. long, the end of which carries the form of switch is neit
. Railway track and track work . about 10 x 16ins., which has lugs to limit the throw and is also formed to hold the endsof the stub rails and keep them from creeping. These rails should also bebolted together, a filler block being placed between the webs, and sometimesa U strap is bolted around the ends of the webs. Cast iron is liable to frac-ture, and wrought iron or cast steel are preferable, the base plate beingabout 1 in. thick. The head chairs are spiked to a heavy timber head blockabout 8 x 12 ins., 12 to 16 ft. long, the end of which carries the form of switch is neither safe, efficient, nor economical, even whenfitted with such devices as-the safety castings of the Tyler and Cookeswitches, which move with the rails and carry wheels coming along thewrong track, which would otherwise drop off the ends of the stub rails ontothe ties. The space between the ends of the switch and stub rail is often as-great as 2 ins., causing severe wear to wheels and switch. On the other 5lot5 for : Lead Rails. Head Chair for Stub Switch. hand, the switch rails may expand in hot weather so as to be jammed in thehead chair, though this may be avoided to some extent by beveling and lap-ping the rail ends for about 12 ins., as at drawbridge connections. Underheavy traffic it is difficult to keep stub switches in proper condition. Inyards having such switches, a large proportion of the track work is in main-taining and repairing the switches, and replacing switch rods and connec-tions damaged by derailments. 104 TRACK. Split Switch.—This consists of two point or switch rails (straight orcurved to fit the curve of the turnout), planed tapering to a vertical edge,so that the ends will fit close against the main or stock rails. The heels ofthe switch rails are towards the diverging tracks, which is the reverse posi-tion from that of the stub switch rails. The two outer rails of these tracksare continuous, the outer rail of the main track continuing unbroken, whilet
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectrailroa, bookyear1901
