TCDD offers economy/business classes only in high speed trains.
Economy class offers 2+2 seats.
Four and a half of the six cars of CAF sets and five and a half of the eight cars of the Siemens sets are sold as economy class.
Some of the economy class wagons may be sold as “economy class + refreshment” depending on the route and time. That means passengers would pay TL 20 (€ 6) more compared with “economy class” and get a free meal during travel (as of March 2017). Economy and economy+refreshment wagons are separate. You need to find seat from the option you want.
Economy passengers have to pay for any refreshment bought in the train.