On 13 December 2018, a high-speed passenger train and a locomotive collided near Yenimahalle in Ankara Province, Turkey.

[1] About four minutes later, a head-on collision occurred when the train collided with a locomotive returning from rail inspection duty, right before the Marşandiz railway station in the Yenimahalle district of Ankara Province.

[1][5] Heavy cranes for wreckage removal arrived at the accident site at 16:00 local time (13:00 UTC), and teams of firefighters and railroad workers continued with cutting and removal work into the night despite heavy snowfall.

Controversy arose when the chairman of the United Transportation Union claimed that "the railway line ... was opened to high-speed rail traffic before the needed train protection system (Turkish: Tren Denetim Sistemi, TDS) was installed".

The prosecutors completed the initial investigation by taking the statements of the three detained railway personnel.

The switchman gave the statement that "he received the order, and set then the electric railroad switch by pressing the related button on the board.

He added that "he did not receive any training in handling of the board, which went in use four days prior to control the electric railroad switch".