Okla. Stat. tit. 66, § 66-125: Signs at crossings - Neglect

In case any railroad corporation shall refuse or neglect, for a

space of thirty (30) days after notice given by the board of county

commissioners, to comply with the provisions of the preceding

section, it shall become the duty of the county commissioners of

each county through which any such railroad shall be in operation to

erect such signs, and the company shall be liable for all expenses

so incurred by said commissioners.