In issuing or selling all tickets for passage in this State through the City of Baltimore, or making agreements with other railroad companies outside of this State to issue or sell tickets for passage through the City of Baltimore, the said tickets shall permit the holders thereof to a stopover privilege of at least forty-eight (48) hours in the City of Baltimore; provided, that nothing in <cite data-path="18|§18-2">this section</cite> shall prohibit railroad companies from issuing and selling tickets without this stopover privilege in the City of Baltimore, for special occasions, when the tickets for passage are good only on excursion trains not on the regular schedule of the railroad. P.L.L., 1915, §792B 1927, §792B 1930, §792B 1938, §975:1949, §603 1969, §18-2 1902, ch. 615