The Khun Tan Railway Tunnel took 11 years to complete, finally opening for traffic in 1918.
The park's altitude allows for a significantly cooler microclimate compared to the surrounding lowland plains.
The summit area features the 'Yao House,' a historic lodge built in the early 20th century.
The park sits on a granite massif that serves as a geological transition zone between the northern and central regions of Thailand.
The 'Mae Long' waterfall is a seasonal feature that is most active during the peak of the monsoon season.
The park was officially gazetted as Thailand's 10th national park in 1975.
Doi Khun Tan National Park is unique for housing Thailand's longest railway tunnel, a 1,352-meter passage bored through the granite mountain. The park spans the boundary between Lamphun and Lampang provinces in Northern Thailand. Its topography is dominated by mountainous terrain ranging from 340 to 1,373 meters above sea level. The forest composition shifts from mixed deciduous at lower elevations to dense pine and evergreen forests near the peaks. The park provides habitat for barking deer, wild boars, and various bird species including the hill myna. Visitor infrastructure consists of four distinct trail markers leading up to the summit area. The park headquarters are situated near the Khun Tan Railway Station, which remains the primary access point for hikers arriving by train. The landscape is characterized by its steep, rugged ridges and seasonal waterfall formations.
The scenic overlook near the fourth trail marker providing a panoramic view of the Northern Thailand mountain ranges.
Bring a high-powered flashlight if you plan to walk near the tunnel area or forest trails.
Prepare for steep inclines, as the path from the railway station to the park headquarters is a persistent uphill trek.
Carry sufficient insect repellent, as the humid, forested environment is prone to mosquitoes and ticks.
Attempting to walk the railway tracks inside the tunnel, which is dangerous and strictly prohibited.
Maintain silence near wildlife viewing areas; pack out all trash to adhere to 'leave no trace' park policies.
