The Wang Pho Viaduct, also Wampo Viaduct or Tham Krasae Railway Bridge (Thai: สะพานถ้ำกระแซ, romanized: S̄aphān t̄ĥả krasæ) is a railway bridge made of wooden trestles which follow the cliff along the Khwae Noi River.

[2] In 1939, plans had been developed by the Empire of Japan to construct a railway connecting Thailand with Burma.

[5] In March 1943,[6] 700 British, 600 Australian, 450 Dutch prisoners of war and 100 Thai forced labourers were assigned to the task.

[11] In December 1944, prisoners of war returned to the site to construct a road from Wang Pho to Tavoy.

[6] It was a three metres wide road through the jungle with a length of 110 kilometres (68 mi) as the crow flies.