A head-on collision between two tourist trains on the rail line to Peru's famed Machu Picchu left one person dead and at least 40 injured on Wednesday, authorities said, revising an earlier casualty toll.

The incident has disrupted travel to one of the world's most iconic archaeological sites and raised urgent questions about safety on the vital route.

The crash occurred around midday on the single-track section linking the town of Ollantaytambo with the gateway to Machu Picchu. According to rail operator Ferrocarril Transandino, a train operated by PeruRail collided with another belonging to Inca Rail. The cause of the accident remains under investigation.

The sole fatality was identified as the conductor of one of the trains, the prosecutor's office in Cusco confirmed. Many of the injured are foreign tourists, with several reported to be in serious condition.

Emergency responders faced significant challenges due to the remote location, which lacks direct road access. At least a dozen ambulances and medical teams were dispatched. Police wearing hardhats and high-visibility vests were seen carrying injured passengers on stretchers from the heavily damaged locomotives.

Videos shared with local broadcaster RPP showed injured passengers lying beside the tracks as emergency personnel attended to them.

The Chinese Embassy in Peru confirmed that four Chinese nationals were among the wounded. They have been transported to local hospitals and are receiving consular assistance. Officials indicated that tourists from other nations were also injured, though a full breakdown of nationalities was not immediately available.

Authorities have launched an investigation to determine whether human error, signaling failure, or a mechanical issue led to the collision. Rail services on the affected section have been temporarily suspended as forensic teams examine the scene and crews work to clear debris.

Both PeruRail and Inca Rail stated they are cooperating fully with the investigation and are assisting affected passengers with medical care, accommodations, and alternative travel arrangements. Limited service may resume after comprehensive safety checks are completed.

The accident deals another blow to the critical tourism corridor serving Machu Picchu, a UNESCO World Heritage Site that draws an average of 4,500 visitors daily. Most access the ancient citadel—perched at roughly 2,500 meters (8,200 feet) above sea level—via train followed by a bus ride.

This incident follows recent disruptions on the route, including protests in September that stranded hundreds of tourists after blocking railway tracks, highlighting the vulnerability of access to the remote destination.

Built in the 15th century under Inca ruler Pachacutec, Machu Picchu is a marvel of ancient engineering. Authorities have pledged to provide further updates as the investigation progresses and the conditions of the injured become clearer. (ILKHA)