G-50 Kozlu-Zonguldak-Üzülmez railway line, which is one of the railway routes used by TTK for coal transportation, is a single-track railway connecting the Central district to Kozlu district. The line consists of two parts, Kozlu-Zonguldak Port and Üzülmez-Zonguldak Port. The first part is 6 km long and was put into service in 1943. The second part, 5.5 km long, was built as a dekovil line in the 1850s, and was converted into a railway line during the Republic period. There are two tunnels with a total length of 1611 meters in the Kozlu direction of the line. A coal train of 10-12 wagons is operated on the lines once a day. “Kozlu-ZonguldakÜzülmez Railway Line Feasibility Report and Concept Development Study” was carried out in order to enable the Kozlu-Zonguldak-Üzülmez line, which is currently used in freight transportation, to be used for passenger transportation and tourism purposes at the same time. Along the railway line in question, TTK Kozlu Institution, İhsaniye district, Çaydamar district, Zonguldak Train Station, Zonguldak Port, Zonguldak Oral and Dental Health Center, Baştarla public buildings, Zonguldak Mining Museum and Üzülmez Culture Valley are located.