W. Va. Code § 21-5-2
Every railroad company, authorized to do business by the laws of this state shall, on or before the first day of each month, pay the employees thereof the wages earned by them during the first half of the preceding month, ending with the fifteenth day thereof; and on or before the fifteenth day of each month, pay the employees thereof the wages earned by them during the last half of the preceding calendar month: Provided, That if, at any time of payment, any employee shall be absent from his regular place of labor, and shall not receive his wages through a duly authorized representative, he shall be entitled to such payment at any time thereafter upon demand upon the proper paymaster at the place where such wages are usually paid and where the next pay is due, and the proper mailing in the United States post office of such payment in time to reach the usual post office of the employee by the time aforesaid, in the usual course of the mails, shall be a compliance with this section.
It shall not be lawful for any railroad company to enter into or make any agreement with any employee for the payment of wages of any such employee otherwise than as provided in this section, except to pay such wages at shorter intervals than herein provided. Every agreement made in violation of this section shall be deemed to be null and void.
W. Va. Code § 21-5-2