Yes it will be extra depends on seat availability
Salient Features of Premium Special Train on Dynamic Pricing posted by Hussain Sir
• Premium special train is being introduced from Railway with dynamic fare pricing.
• Dynamic fare stands for the fare component which may be increased with the subsequent bookings.
•...
more... Advance Reservation Period (ARP) of this train will be a maximum of 15 days.
• Agents will not be allowed to book tickets in these trains.
• Dynamic fare shall be charged for confirm as well as RAC passengers.
• Waitlist Ticket Booking is not allowed in this train.