All railroads shall, on such parts of their rights of way as are operated through forest lands, maintain from April first to November fifteenth of each year a sufficient number of competent fire patrolmen unless relieved by the department. The railroad shall file in the office of the department on or before April first of each year a complete list of such patrol indicating the names of the persons, their post-office address and portion of right of way assigned to each patrolman. If any changes are subsequently made similar data shall be furnished the department.