LOCOMOTIVE; SHOPS, A. T. & S. F. R. R. 



369 



alternate pairs of trusses. End trusses are built into the walls, as 

 these walls are pierced by numerous windows and doors and are not 

 relied upon in any way to support the roof. Portal bracing is fitted 

 between the side or wall columns at intervals. No metal less than ^-in. 

 thick is used in the structural work. 



1^ Wl-^W^-W^ 1x03 1 



Elevation A-&. 



Elevai-ion C-D. 



Cross Section of Machine Shop. 



Riveting Tower- 



Plan 





Elevation G-H. 



Cross Section of Boiler Shop. 



FIG. 173. PART ELEVATIONS AND PLANS OF STEEL STRUCTURAL WORK 



OF NEW LOCOMOTIVE SHOPS. 



The roof trusses are proportioned for a load of 15 Ibs. per sq. ft. 

 for the weight of the roofing, 10 Ibs. per sq. ft. for snow, and 25 Ibs. 

 per sq. ft. for wind pressure, or 50 Ibs. per sq. ft. in all. The members 



FIG. 174. HALF EAST ELEVATION OF NEW LOCOMOTIVE SHOP. 

 (SHOWING RIVETING TOWER AND WEAVING SHED ROOF.) 



