[Footnote A: "The Economic Theory of Railway Location," 1887 edition,
p. 502.]
[Footnote B: _Transactions_, Am. Soc. C. E., Vol. L, p. 1.]
[Footnote C: "Nearly 200 tons _exclusive_ of eng. & ten." (Vol. III,
p. 176-1/10.)]
[Footnote D: American Railway Engineering and Maintenance of Way
Association, Bulletin 84, February, 1907, p. 99.]