Mass. Gen. Laws ch. 160, § 193: Sale of season tickets to express messengers; release of liability for personal injury

Section 193. Every railroad corporation shall sell to an express messenger or to a person conducting a local express business, as provided in section two hundred and six, in its trains or cars within the commonwealth, a season ticket for his personal transportation, at a price not exceeding that at which similar tickets are sold to passengers, upon receiving from him a release of all right, to whomsoever accruing, to damages or compensation for death or for any personal injury received by him while riding on such ticket.