204 



STEEL RAILWAY BRIDGES. 



CHAP. IV. 



TABLE XIV. 

 DATA ON TIES ON BRIDGES. 



TABLE XV. 

 DATA ON DEAD LOADS. 



per sq. in. and the lowest is 15,000 Ib. per sq. in. Of the 39 roads considered all except one use a 

 concentrated system of engine loadings; one road, the Pennsylvania Lines West of Pittsburgh, 

 uses a uniform load of 5,500 Ib. per lineal foot of track and an excess load of 66,000 Ib. on one 

 axle; no road is using an equivalent uniform load. For data on the heaviest locomotives in service 

 and the relative stresses due to these locomotives compared with E 50 loading see Table II. 



Mr. Greiner's conclusion is that E 50 bridges will safely carry all loads that can be carried 

 without increasing the present vertical and horizontal clearances. 



