Wyo. Stat. § 37-9-601
Whenever any railroad company shall contract with any person, persons or corporation for the construction of its railroad or any part thereof, the company shall take from the person, persons, or corporation with whom a contract is made, a good and sufficient bond, in some guarantee or surety company authorized to do business in this state, conditioned that the contractor or contractors shall pay or cause to be paid all laborers, mechanics, materialmen, ranchmen, farmers, merchants, and other persons who supply the contractor or contractors, or any of his or their subcontractors, with labor, work, material, ranch or farm products, provisions, goods or supplies of any kind, all just debts incurred therefor in carrying on the work, which bond shall be filed by the company in the office of the county clerk in the county where the principal work of the contractor shall be carried on; and if any railroad company shall fail to take a bond, the railroad company shall be liable to the persons herein mentioned to the full extent of all debts so contracted by the contractor, or contractors, or any of his or their subcontractors. Any contractor or contractors may take a similar bond from each of his or their subcontractors to secure the payment of all debts of the kind above mentioned, incurred by him, and file the same as above provided. All persons mentioned in this section to whom any debt of the kind above mentioned shall be due from any contractor or subcontractor shall severally have a right of action upon any bond covering the debt taken as herein provided for the recovery of the full amount of the debt, and a certified copy of the bond shall be received as evidence in any action; provided, however, that in order that the right of action upon the bonds may exist, the person or parties herein granted the right shall comply with either of the following conditions, to-wit: First, an action in a court of competent jurisdiction, in the county where the bond is filed shall be commenced within ninety (90) days after the last item of indebtedness shall have accrued; or second, an itemized statement of the indebtedness duly verified shall within ninety (90) days after the last item of the indebtedness shall have accrued be filed in the office of the county clerk of the proper county; and an action shall be brought in any court of competent jurisdiction of the county within three (3) months after the filing of the statement. In case an action is commenced upon the bond of a contractor, the contractor may give notice thereof to the subcontractor liable for the claim, and in a case the result of the action shall be binding upon the subcontractor, and his sureties, and in any case when a contractor has paid a claim for which a subcontractor is liable, the contractor shall bring action against the subcontractor and his sureties within sixty (60) days after the payment of the claim.
W.S. 37-9-601