LOCOMOTIVE SHOPS, A., T. & S. F. R. R. 371 



chamber filled with coils of pipe through which passes the exhaust 

 steam. The hot air is delivered into two longitudinal underground con- 

 duits parallel with the lines of columns, with a duct leading to the sur- 

 face at each column. Each duct is fitted with a vertical sheet iron pipe 

 7 ft. high, with a flaring head to deliver the air horizontally. The plant 

 is guaranteed to maintain a temperature of 70 F. throughout the shop 

 in zero weather. 



The floor foundation is formed of 6 inches of concrete resting on 

 the natural soil well tamped. The concrete is composed of I part Louis- 

 ville cement, 2 parts sand and- 4 parts stone. On the concrete are laid 

 yellow pine nailing strips, 3" x 4", 18 ins. c. to c., to which is spiked 

 the I ^4 -in. splined hard-maple flooring. All tracks in the shop are laid 

 with 75-lb. rails on ties of New Mexico pine treated by the zinc-chlor- 

 ide process, the floor concrete being laid only to the ends of the ties, 

 so that adjustment of the track can be made without tearing up the 

 floor. At the engine pits (which are of concrete) the rails are laid on 

 longitudinal timbers. The concrete for column foundations is com- 

 posed of I part lola Portland cement, 3 parts sand and 5 parts stone. 

 These foundations are 8 to 15 ft. deep, extending to solid clay. They 

 are built up with gas pipe sleeves to form holes for the anchor bolts, 

 and the holes in the bed plates of the columns are slotted longitudinally 

 so as to allow of adjustment for any slight variation. The foundations 

 for the tools, etc., are also of Portland cement concrete, and these 

 are built by the mechanical department to suit its own requirements as 

 to arrangement of tools. This arrangement was only arrived at after 

 careful study, and of course no changes can be made without expen- 

 sive work in cutting out and replacing concrete. One suggestion for the 

 floor construction was to use a brick floor with no concrete, so as to 

 allow for future changes and putting in new foundations. 



