TCDD offers economy/business classes only in high speed trains.
Business class offers 2+1 leather seats with multi-media screen on each seat.
First wagon (no:1) of CAF and Siemens HST sets is for business class.
Surcharge for business class is about 13-18 TL/person (as of January 2018).
Some seats of the business class wagons may be sold as “business class + refreshment” depending on the route and time. Packed food service is given for those seats. This option is about TL 20 (€ 5) (as of January 2018). Business and business+refreshment seats are separate. You need to find seat from the option you want.