Mass. Gen. Laws ch. 160, § 205

Every railroad corporation shall, subject to the provisions of section two hundred and eleven, give to all persons reasonable and equal terms, facilities and accommodations for the transportation upon its railroad of themselves, their agents and servants, and of their merchandise and other property and for the use of its depot and other buildings and grounds; and, at any point where its railroad connects with another railroad, it shall give reasonable and equal terms and facilities of interchange.