Hong Kong Regulations

MASS TRANSIT RAILWAY BY-LAWS - BYLAW 12A

Insufficient class accommodation

(1) The Corporation shall not be liable for any failure to carry a passenger
in any first class compartment of any train where there is insufficient first
class accommodation. In case of such insufficient accommodation, a ticket may
be refunded before the passenger in respect of whom the ticket has been issued
travels on any train.

(2) Where there is insufficient first class accommodation on any train for
which a ticket has been issued, a passenger holding a first  class ticket may
travel in standard class accommodation without the right to claim a refund of
the appropriate difference in fare. (L.N. 156 of 2007)