What is Hellfire Pass? The cutting and its trail

A rail link between Burma and Thailand was not a Japanese idea. It had been proposed decades before the war, and the British surveyed a route in the 1880s but did not build it.¹⁴ Japanese engineers surveyed the route more than once before the army committed to it in June 1942, relying on prisoners of war.¹⁵

The reason was logistics. Sea routes to Burma had become vulnerable, so the army wanted a land route.¹⁶ A railway wants a gentle gradient, and where the hills could not be avoided the builders dug cuttings so the line could carry on, often emerging from a deep cutting onto embankments and bridges. Hellfire Pass is the deepest example on the stretch that visitors can walk.

Work on this section started on Anzac Day, 25 April 1943.³ That date is also the day of the dawn service held at the pass each 25 April.¹⁷ Overall, work on the railway started in October 1942 and ended on 16 October 1943.¹⁸ The cutting therefore belongs to the final months of the build, a period the speedo section below describes.

The pass became a bottleneck, because cutting rock by hand is slow. Japanese engineers answered by forcing teams to work around the clock.³⁸ The Hellfire Pass site dates the worst period from July, when shifts of 12 to 18 hours with no rest day began, and says it lasted until the section was finished in August 1943. Prisoners called this period speedo.¹⁰

The Thailand-Burma Railway Centre dates the speedo period differently, from March to September 1943, and says most deaths occurred then.²⁰ The official sources disagree on the dates, so treat them as a range rather than a single window. Both agree on the pattern: pressure to finish, long shifts and very little rest. Shifts could run up to 18 hours a day under the threat of violence.³⁹

The Hellfire Pass site gives a death rate here that was 8 to 10 per cent higher than on other parts of the railway.²¹ For the line as a whole the same site gives far larger totals of prisoner and romusha deaths, which the history guide on this site sets out.¹⁹ Some survivors reckoned a life was lost for each sleeper laid.⁴⁰ The figures are given as the memorial gives them, and they are estimates.

After World War II parts of the railway, Hellfire Pass included, were abandoned. Hard terrain and sad memories kept visitors away, and for decades nobody touched the site.¹¹ In the 1980s former prisoners and adventurous tourists rediscovered the pass, and their stories showed why the site needed preserving.¹²

The Hellfire Pass Interpretive Centre was officially opened in 1998.¹³ It turned a half-forgotten cutting into a place with a visitor building and a marked trail. The Anzac Day dawn service has been held at the pass every 25 April since 1998 and draws visitors from around the world.¹⁷ On that day the site opens at 3.00 AM, the public are asked to be seated by 5.00 AM and the service starts at 5.30 AM.²³

Attendance shows how far the place has come from its years in the jungle. The Centre and walking trail welcomed more than 166,000 visitors in 2025.⁴² If you are travelling in late April, plan around the dawn service, which is a commemoration before it is a visit, and arrive in good time. On an ordinary day a morning visit means fewer people on the narrow parts of the trail and better shade before midday.