FOOTNOTES:

[A] "The Economic Theory of Railway Location," 1887 edition, p. 502.

[B] Transactions, Am. Soc. C. E., Vol. L, p. 1.

[C] "Nearly 200 tons exclusive of eng. & ten." (Vol. III, p. 176-1/10.)

[D] American Railway Engineering and Maintenance of Way Association, Bulletin 84, February, 1907, p. 99.