must be notched down over the longitudinal girders so as 

 to reduce the camber in the track, as directed by the 

 Engineer. 



17. All the floor timbers shall have a full and even bear- 

 ing upon the stringers; no open joints or shims will be 

 allowed. 



1 8. On curves the outer rail must be elevated, as may be 

 directed by the Engineer. ( 5.) 



Proposals. 19. In comparing different proposals, the relative cost to 

 the Railroad Company of the required masonry or changes 

 in existing work will be taken into consideration. 



20. Contractors in submitting proposals shall furnish com- 

 plete strain sheets, general plans of the proposed structures, 

 and such detail drawings as will clearly show the dimen- 

 sions of all the parts, modes of construction and the sec- 

 tional areas; and state kind of material to be used ( 138, 



144). 



21. Upon the acceptance of the proposal and the execu- 

 tion of contract, all working drawings required by the En- 

 gineer must be furnished free of cost. 



al of 22. No work shall be commenced or materials ordered 

 until the working drawings are approved by the Engineer 

 in writing ; if such working drawings are detained more than 

 one week for examination, the Contractor will be allowed 

 an equivalent extension of time. 



LOADS. 



23. All the structures shall be proportioned to carry the 

 following loads : 



ist. The weight of metal in the structure and floor. 

 Dead Load. 2d. The weight of rails, fastenings, ties, guards, footwalk 

 and ballast when used. The rails and fastenings being 

 assumed at 100 pounds per foot of track ; timber at 4^ 

 pounds per foot B. M. ; and ballast at 110 pounds per 

 cubic foot. Minimum will be assumed at 400 pounds per 

 foot of track. 



These two items, taken together, shall constitute the 

 " dead load." 



