Notwithstanding the provisions of § 46.2-2099.42, no private excursion train operator that has entered into a public-private partnership contract with the Authority pursuant to the Public-Private Educational Facilities and Infrastructure Act of 2002 (§ 56-575.1 et seq.) shall be liable upon a claim of personal injury or wrongful death arising from the operation of an excursion train, including operations, maintenance, or signalization of the tracks or facilities upon which the excursion train operates, except in the case of the gross negligence or intentional act of the private excursion train operator. Any authority created pursuant to this chapter shall post notice of such immunity from liability at the time of ticketing and at all train entrances.