EXAMPLES OF FLOORS 289 



The flooring in the Great Northern Shops at St. Paul, Minn., is 

 3" x 12" plank on 6" x 8" sleepers bedded in 18 inches dry sand rilling. 



The floor of the locomotive shops of the Philadelphia and Reading 

 R. R., is made of bituminous concrete on which are a solid course of 

 3" x 8" hemlock and a top wearing surface of i^/s" x 4" maple. 



The machine shop floors of the Lehigh Valley R. R. at Sayre Pa., 

 are of concrete with a maple wearing surface in the high grade buildings 

 and yellow pine in the others. 



The Southern Railway has a vitrified brick floor in a round house 

 at Knoxville, Tenn., which is giving good satisfaction. The cost of this 

 floor was about $1.00 per square yard. 



Shop floors for the American Locomotive Works, Schenectady, 

 N. Y., are described in Engineering Record, May 30, 1903 ,as follows : 



"On a sand fill was laid from 4 to 6 inches of 2^ -inch broken stone, 

 rammed dry and then flushed with about one gallon of hot tar for 

 every square yard of floor. This course was covered with 2 inches of 

 hot sand and tar mixed to the consistency of dry mortar, shoveled into 

 place and thoroughly rammed to a level surface. Spiking strips made 

 of 3" x 4" timbers were imbedded in the sand at about 3-ft. centers. To 

 these strips were spiked 2-in. rough hemlock planks, which were in 

 turn covered with transverse tongued and grooved J^-in. maple boards 

 4 inches wide." 



Cedar Blocks form a neat, clean and durable floor. Care should 

 be used where heavy jacking is to be done on wooden block floor 

 that the blocks are not forced down through the plank foundation. 



A cedar block floor in the Chicago Ave. round house of the C & 

 N. W. R. R., laid on planks on a gravel foundation cost about 1 1 cents 

 per square foot. 



*A cedar block floor on the C. & E. I. R. R., laid directly on a 

 gravel foundation cost 8 cents per square foot. 



*A floor constructed of 6 to 8-inch blocks sawed from old bridge 

 timbers, set on 2-Inch hemlock plank, which in turn rested on 3 inches 



*Reports Association of Railway Superintendents of Bridges and Buildings. 



