Okla. Stat. tit. 66, § 66-145: Railroads must fence right-of-way with hog wire, when

Whenever the owner or occupant of any tract of land abutting on

any line of railroad within this state shall desire to enclose any

such tract of land for the purpose of making a hog, sheep or goat

pasture, and shall construct a fence for said purpose about said

tract of land on all sides except along the side abutting on such

railroad, it shall be the duty of such railroad company to construct

a good and sufficient fence not less than four and one-half (4 1/2)

feet high, one barbed wire at bottom of such fence immediately above

which shall be attached heavy woven wire not less than twenty-eight

(28) inches high, and sufficient for the purpose of restraining

swine, sheep and goats, with three barbed wires above the same, on

the side of such tract, so far as the same extends along the line of

such railroad, and maintain the same in good condition, so long as

such owner or occupant of such tract may desire to maintain such

pasture.