200 



STEEL RAILWAY BRIDGES. 



CHAP. IV. 



fications of the American Railway Engineering Association; the specifications in each case differing 

 from the specifications of the American Railway Engineering Association only in requirements 

 for clearances, and in minor clauses, and clauses required to cover individual practice, and local 

 conditions of the individual roads. 



TABLE XL 



RAILWAY BKIDGE CLEARANCES 



3 



-^ ^! ^i 

 i| s:|M ^ ] . 



* ^i 



_.i.Ti...i 



FIG. 47. CLEARANCE DIAGRAM. 



The present practice is to use the specifications of the American Railway Engineering Associ- 

 ation as a basis for specifications and to add such additional clauses as may be necessary to cover 

 .the practice of the individual railroad. Several railroads have adopted the specifications of the 

 American Railway Engineering Association and issue supplementary instructions to cover their 

 individual practice; see standards of Chicago, Milwaukee & St. Paul Ry. which follow the 

 A. R. E. A. specifications in this chapter. The specifications of the American Railway Engineering 



