Intermediate timings etc. are frequently not given. Timetables change irregularly and without prior notice to the public. Many trains run every day of the week. No lines other than Standard gauge are operational. New systems under construction in Adana and Bursa.
Trains can be very crowded.
For all main line express trains, especially during weekends and during the school holiday period July - September, reservations are recommended. For express services on the main routes, normally not more tickets are being sold than the local seat contingency of each served station allows. Reserved seats are not marked as such. Punctuality of long distance trains is often low, and with the exception of a few dedicated connecting services, trains would usually not wait for possible late running feeder services. Other publications are usually not up to the most recent status, but as the timetable structure is only little changing, they might at least give an indication of service frequency.