Baku–Tbilisi–Kars railway

The Baku–Tbilisi–Kars (BTK), or Baku–Tbilisi–Akhalkalaki–Kars railway (BTAK), is a railway connecting Azerbaijan, Georgia and Turkey, which became operational on 30 October 2017 following several years of delays. The project was originally due to be completed by 2010, but was delayed to 2013, 2015, 2016, and, following a fifth trilateral meeting in February 2016, foreign ministers of the three countries announced that the railway would finally be completed in 2017.

Source: Wikipedia — Baku–Tbilisi–Kars railway (CC BY-SA 4.0)