N.Y. RRD Law § 50

§ 50. Liability of corporation to employees of contractor. An action\nmay be maintained against any railroad corporation by any laborer for\nthe amount due him from any contractor for the construction of any part\nof its road, for ninety or any less number of days' labor performed by\nhim in constructing such road, if within twenty days thereafter a\nwritten notice shall have been served upon the corporation, and the\naction shall have been commenced after the expiration of ten days and\nwithin six months after the service of such notice, which shall contain\na statement of the month and particular days upon which the labor was\nperformed and for which it was unpaid, the price per day, the amount\ndue, the name of the contractor from whom due, and the section upon\nwhich performed, and shall be signed by the laborer or his attorney and\nverified by him to the effect that of his own knowledge the statements\ncontained in it are true. The notice shall be served by delivering the\nsame to an engineer, agent or superintendent having charge of the\nsection of the road, upon which the labor was performed, personally, or\nby leaving it at his office or usual place of business with some person\nof suitable age or discretion; and if the corporation has no such agent,\nengineer or superintendent, or in case he can not be found and has no\nplace of business open, service may in like manner be made on any\nofficer or director of the corporation.\n