The Saphan Tha Chomphu or Tha Chomphu Bridge is located opposite Wat Tha Chomphu, Tambon Tha Pla Duk, Amphoe Mae Tha, and known among the locals as Saphan Khao - the White Bridge. It was constructed in 1919 under the supervision of H.R.H. Prince of Kamphaeng Phet. The white railway bridge, measuring 87.3 m. long, is the landmark of the valley near the Khun Tan Tunnel and was built of reinforced concrete, unlike other usual steel railway bridges that are flexible and more durable to vibration. Unfortunately, as the period of construction was during wartime, steel was in short supply. Thanks to excellent calculation and supervision, the bridge can still be used today. The Tha Chomphu Bridge spans the Tha River and is located in the middle of an open valley on the Bangkok - Chiang Mai route. The train reaches the bridge approximately 1 hour before arriving in Chiang Mai.