The main train service connecting Istanbul to Afyonkarahisar is operated by the Turkish State Railways, featuring the high-speed YHT (Yüksek Hızlı Tren) trains on segments of the route. Although there are no direct high-speed trains throughout the entire journey, part of the trip can be completed on YHT trains. These trains can reach speeds of up to 250 km/h (155 mph) on high-speed segments, reducing travel time significantly. The complete journey from Istanbul to Afyonkarahisar takes approximately 7 to 8 hours, depending on the connections. For travelers preferring a scenic experience, the journey passes through diverse landscapes, including lush green hills and smaller towns. Passengers will find comfortable seating, with options for refreshments onboard. It's worth noting that while there are faster connections available partway through, much of the route retains traditional speeds of around 100-120 km/h (62-75 mph) outside of the high-speed segments.