At 17:15 Turkish time on July 8, 2018, five bogies of a six-car train operating with train number 12703 on the Uzunköprü-Halkalı railway line en route to Halkalı Terminal in Istanbul derailed at 162 km (101 mi) near Sarılar village of Çorlu, Tekirdağ. Of the 362 passengers and six crew on board, 24 were killed and 318 injured. 276 lightly injured passengers were discharged from the hospitals after receiving treatment, while medical care for the 42 severely injured victims continues in hospitals in Tekirdağ, Çorlu and Istanbul.
The Turkish Ministry of Transport, Maritime Affairs and Communications announced in a statement right after the accident, that the derailment occurred after the railway track slipped down from its original position due to torrential rains. It was reported that the track was intact when a scheduled train passed through that location at about 10:40 local time the same day. Heavy rainfall at a rate of 32 kg/m2 (6.6 lb/sq ft) per hour occurred between 14:20 and 15:10 in the region. Investigations revealed that a culvert under the railway had collapsed as flood water sapped it by washing away the soil underneath its foundation, and as a result the track ballast under the tracks lost its support. However, the sleepers at that spot appeared to be in good order to the railroad engineer of the train, which was running at a speed of 100–110 km/h (62–68 mph). The locomotive ran through without incident, then the first car derailed, although it remained upright. The following five cars, however, fully derailed and overturned, destroying 400 m (1,300 ft) of tracks.
Numerous Russian news sources reported that Russian tourists were among the injured. The Radio and Television Supreme Council imposed a temporary ban on broadcasting the accident.