Analyzing the investment expenditure data on railway infrastructure in Turkey, we observe fluctuations from 2013 to 2023. The highest year-on-year growth was recorded in 2013 with 63.56%, followed by a substantial drop in 2014 and 2015. Significant growth occurred again in 2016, peaking at 75.82%. After a 41.75% drop in 2020, the investment rebounded with a 76.03% increase in 2021. As of 2023, investment stood at 8.29 Billion New Turkish Liras, representing a 3.38% increase from the previous year.

From 2023 onwards, forecasted data indicates a steady growth trend, with the investment expected to grow by 13.09% by 2028, showing a 2.49% average annual increase (CAGR). This points to a progressive but stable rise in investment expenditure on railway infrastructure.

Future trends to watch for:

Government policies and budget allocations impacting infrastructure investment.
Technological advancements and their integration into railway infrastructure development.
Private sector investments and international collaborations/influence.