Upon the execution of said deed and acceptance thereof by the Mayor and City Council of Baltimore embodying said contract prohibiting the locating or placing of car tracks upon any part of the land so to be granted, the said contract shall be and is hereby declared to be forever thereafter inviolable; provided, however, that nothing herein contained shall prevent the Mayor and City Council of Baltimore from authorizing by ordinance the location or construction of car tracks on such part of the bed of said street as are contained within the limits of intersecting or cross streets that are now or may hereafter be provided for by ordinance of said Mayor and City Council of Baltimore. P.L.L., 1915, §837 1927, §837 1930, §837 1938, §1068 1949, §689 1969, §21-26 1894, ch. 123 1898, ch. 123, §837