ยง 505. Actions involving public authorities. (a) Generally. The place of trial of an action by or against a public authority constituted under the laws of the state shall be in the county in which the authority has its principal office or where it has facilities involved in the action. (b) Against New York city transit authority. The place of trial of an action against the New York city transit authority shall be in the county within the city of New York in which the cause of action arose, or, if it arose outside of the city, in the county of New York.