WEIGHTS OF DRAW SPANS AND SIGNAL BRIDGES. 



157 



e'O" Cltar. 



11111 Illlllllll Hill Illlllllllll't. mil III 



e: 



:;::; ::::;:::;:;:::;:::::::!!:::;:::::::::::::::::::::::: 

 I? iili ::!!!!:!:::!!!!:::: 



iiiiiiiiSiiiiiiiiiiiiiiiSiiiiiisllliSiiiiiiiiiiiiiiiiiiiiiii 

 :::::::::!!::ii::::::::::::::::::i::::::::ui 



26000 28000 



14000 16000 



2ZCOO- 24000 



Mote * All 'spans figured to carry a signdl 

 18000 2QOOO neighing 2000 pounds over each track 



W' Weight of one span and two bents 

 0-62Hf"ffejght of or* span 

 flti W= Weight of tno bents- 



WEIGHTS OF 5/6NAL BRIDGES 



dooo ioooa 12000 



WEIGHT IN POUNDS 



FIG. 15. WEIGHTS OF SIGNAL BRIDGES. 

 ILLINOIS CENTRAL RAILROAD. 



Aim inn mil iimiirii mil mil mil 

 liiiiliiiiiiitliiiii'.iiiiiiiiiiiiilimi 



IIIW%IIIIIIIIIIIIIIIIIIIII 



liiiiiiiliir.iiiiiiiiiiiiiiini 



130 



1000 



800 



Loading- 2-188-75 ton engines followed by 

 6000 Ibs-per foot uniform had . 



For Double Track Spans 



hcrvase curve freights SSptr cent- 



WEIGHTS OF SINGLE TRACK 

 DRAW SPANS 



200 



400 



600 



HEIGHTS IN THOUSANDS OF POUNDS 



FIG. 16. WEIGHTS OF SINGLE TRACK DRAW SPANS. 

 ILLINOIS CENTRAL RAILROAD. 



