RAILROAD CONSTRUCTION 



289 



ESTIMATED AMOUNT OF MATERIAL REQUIRED FOR ONE 

 MILE OF TRACK FOR RAILS OF A GIVEN WEIGHT 



Weight of rails 

 per yard 



Number of tons 

 of 2240 pounds. 



Pounds of spikes . . 



Number of angle 

 bars 



Number of cross- 

 ties 



Pounds of bolts 

 and nuts 



94.28 



5870 



357 

 2640 

 1825 



a STUB SWITCH 



Q^yp-nnnnnnnn 



SPLIT SWITCH 



C - 



de =Toeof Frog 

 ab ^Frog Heel 

 acb -Frog Angle = dce 

 Ch = Length of Frog 

 The Frog Number "»i' ' = ff 



Fig. 83. — Two Forms of Turnouts used on Logging Railroads, a, the stub 

 switch, h, the split switch, c, a standard frog. 



