All of the main line trains and some of the regional trains have coach cars with only seats. Coach cars are called “pulman” in Turkish.
This type coach cars have 60 seats, one seat in one side of aisle, two seats in other side. Double seats are sold gender specific unless they’re sold together. Last seats of the car is on reverse direction, with table in between.
Seats are reclining and comfortable, distance between two seats is quite enough. In general, it’s hard but possible to change the direction of the seats.
There is luggage space over seat, table in front.
A few of the carriages have electric plugs on sides.
In both sides of the car, there are WCs. There’s electric plug in WCs.