234 



TRACKWORK 



The corrected elevations will be 



At C 52.80+ .00 = 52.80 



At second stake 51.60+ .15 = 51.75 



At third stake 50.40+ .60 = 51.00 



At fourth stake 49.20+1.35 = 50.55 



At fifth stake 49.80+ .60 = 50.40 



At sixth stake 50.40+ .15 = 50.55 



At D 51.00+ .00 = 51.00 



TRACKWORK 



TRACK MATERIALS 



Rails. The illustration shows, in cross-section, the general 

 form of rail adopted by the American Society of Civil Engi- 



neers and now used by most 



___ - , . railroads: PQ is the head; 



H* , pi MN, the web; and KL, the 



\G r\ k U<? flange, or base. The metal 



** ' |JL is distributed through the 



section in the following pro- 

 portions: head, 42%; web, 

 21%; flange, 37%. The 

 dimensions indicated in the 

 illustration for the differ- 

 ent weights of rails are 

 given in the accompanying 

 table. 



Required Weight of Rail. 

 Rule I, which was first pub- 



lished by the Baldwin Locomotive Works, gives fairly approxi- 

 mate results for light loads; for very heavy loads, however, the 

 weights obtained by it are too large. Rule II agrees more 

 closely with present American practice. 



Rule I. Divide the greatest load, in pounds, that will be sup- 

 ported by any wheel, by 824; the quotient is the required -weight 

 of the rail in pounds per yard. 



