Transport Asset Manager of New South Wales and the State Transit Authority must pay such amounts to TfNSW as TfNSW determines from time to time as contributions in relation to--
(a) in the case of Transport Asset Manager of New South Wales--the movement of rolling stock over railway lines vested in or owned by that corporation on the Sydney Harbour Bridge, and
(b) in the case of the State Transit Authority--the carriage of passengers across the Sydney Harbour Bridge.