29 



APPENDIX II 



TYPES OF SPANS 



IIII 



I I 



Span may consist of any number of I Beams. 

 I 



I BEAM SPAN 



Timber deck carried directjy on top flanges 

 of Main Girders. 



DPG 

 DECK PLATE GIRDER SPAN 



IT U 



Timber deck carried on floor system above 

 tops of Main Girders. 



HTPG 

 HALF THROUGH PLATE GIRDER SPAN 



Timber deck carried on floor system below 

 tops of Main Girders. 



TPG 

 THROUGH PLATE GIRDER SPAN 



Deck carried on top chords of Trusses or 

 on floor system, with ties above top chords. 



DT 

 DECK TRUSS SPAN 



Deck carried on floor system between 



Trusses and Trusses braced to each 



other above Track Clearance. 



TT 

 THROUGH TRUSS SPAN 



^ 



Through Truss Span with no 

 overhead bracing. 



PT 

 PONY TRUSS SPAN 



