Section 129B(3) in Chennai City Municipal Corporation Act, 1919
(3)Subject to the provisions of sub-section (2) in the case of an advertisement liable to the advertisement tax, the commissioner shall grant permission for the period to which the payment of the tax relates and no fee shall be charged in respect of such permission:Provided that the provisions of this section shall not apply to any advertisement erected, exhibited, fixed or retained on the premises of a railway company, relating to the business of a railway company.