Section 37-9-701 - Contracts valid; conditions to validation against subsequent purchaser for value(a) In any contract for the sale of railroad or street railway equipment or rolling stock, it shall be lawful to agree that the title to the property sold or contracted to be sold, although possession thereof may be delivered immediately, or at any time or times subsequently, shall not vest in the purchaser until the purchase price shall be fully paid, or that the seller shall have and retain a lien thereon for the unpaid purchase money. And in any contract for the leasing or hiring of such property, it shall be lawful to stipulate for a conditional sale thereof at the termination of such contract, and that the rentals or amounts to be received under such contract, may, as paid, be applied and treated as purchase money, and that the title to the property shall not vest in the lessee or bailee until the purchase price shall have been paid in full, and until the terms of the contract shall have been fully performed, notwithstanding delivery to and possession by such lessee or bailee; provided, that no such contract shall be valid as against any subsequent judgment creditor, or any subsequent bona fide purchaser for value and without notice, unless: (i) The same shall be evidenced by an instrument executed by the parties and duly acknowledged by the vendee or lessee or bailee, as the case may be, or duly proved, before some person authorized by law to take acknowledgment of deeds, and in the same manner as deeds are acknowledged or proved; (ii) Such instrument shall be filed for record in the office of the secretary of state; (iii) Each locomotive engine, or car so sold, leased or hired, or contracted to be sold, leased or hired as aforesaid, shall have the name of the vendor, lessor, or bailor plainly marked on each side thereof, followed by the word "owner" or "lessor" or "bailor", as the case may be.