McKenna Process Company
Plant formerly located in Joliet, Illinois - ca. 1920.
Image 6 - Grading old rails according to the type of wear
Inspected and Graded Rails - overall - McKenna Process Company
Image 6. Grading old rails for rerolling. The rails 
standing upright have been measured and graded
according to their degree of head wear, for rerolling
to A, B and C sections as marked at ends.


Details scanned from the original print:

a. Inspected & Graded Rails - Marked - A-B-C
b. Inspected & Graded Rails - Marked - A-B-C-Details
c. Inspected & Graded Rails - Marked - Three Each
A-B-C for Comparison with US Pat. No. 1,212,364
by George Langford, Sr.
d.
The Three Workmen Overlooking Their Product

The rails are actually elongated just enough to allow
the cropping of the ends containing the rail's original
splice-bar holes. See Image 13.
Inspected and Graded Rails - marked - A - B - C
Inspected & Graded Rails - Marked-A-B-C:

It was quite important that the rails with differing
degrees of head wear be rolled in the appropriate roll
pass; the rail would curve dramatically if the head and
flange were not elongated exactly the same.
Inspected&Graded Rails-Marked-A-B-C-Details
Inspected and Graded Rails - detail view

Inspected & Graded Rails - Marked - Three Each  A-B-C for 
Comparison with US Pat. No. 1,212,364 by George Langford, Sr.
Inspected and Graded Rails - montage of three each, A/B/C
George Langford US Patent No. 1,212,364 text column 1
George Langford US Patent No. 1,212,364 column 2
The Three Workmen Overlooking Their Product
Image 6 - Inspected and Graded Rails - the workmen