McKenna Process Company
Plant formerly located in Joliet, Illinois - ca. 1920.
Image 14 - Hot rails undergoing controlled cooling
Controlled cooling of rerolled rails - Overall
Image 14. After sawing, the rerolled rails are branded, 
hot straightened in cambering rolls and then run out
upon a cooling bed. This is the "critical" period and
care must be used that the hot rails do not touch each
other (rails at left). On reaching the "recalescence
*
point," they are turned completely over (rails at right).
This spacing and turning over insures even cooling,
thereby relieving internal strains and need for excessive
cold-straightening.

Details scanned from the original print:
a. Controlled Cooling Of Rerolled Rails-Overall
b. CloseUp with Hot Saw (in the left background)
Note the piles of cropped rail ends at the rear.

* There is a sudden change in density of the iron
while it changes its crystal structure and reheats itself.
Controlled cooling of hot rails - Detail of hot saw and cropped ends
CloseUp with Hot Saw (in the left 
background)

Note the piles of cropped rail ends
at the center background in the image