Four workers were killed last week in a train accident while clearing weeds from railway tracks at Shin-Kanuma Station in Tochigi Prefecture, with preliminary investigations pointing to inadequate safety monitoring as a possible contributing factor. The incident occurred on August 20 at approximately 10:45 a.m. local time on the Tobu Railway Nikko Line in the city of Kanuma.

The victims were employees of Tobu Construction, an affiliate of Tobu Railway based in Nikko City, along with personnel from a subcontractor. They were struck by a Spacia X limited express train during the track maintenance work. At the time, seven workers were present on the tracks, including the four who were fatally injured. Three others evacuated onto the station platform upon noticing the approaching train.

According to information provided by local police and the Japan Transport Safety Board, the operation involved a total of ten individuals. Seven workers had begun clearing weeds on the tracks around 10 a.m., while three others were assigned to safety roles. These three, employed by a security service company, included one train lookout positioned near the station and two relay lookouts stationed approximately 300 meters away at nearby railway crossings.

Under established safety protocols for working near railway tracks during train operations, relay lookouts communicate with the train lookout via radio or flag signals. The train lookout is responsible for relaying information to the workers and sending signals to approaching train drivers. Specifically, once workers have safely evacuated, the train lookout signals the driver by displaying a yellow flag horizontally. If the area is not confirmed as safe, a red flag is shown to halt the train.

At Shin-Kanuma Station, investigators believe the train lookout signaled the approaching Spacia X driver with a yellow flag, indicating that the workers had evacuated. The train driver acknowledged seeing the yellow flag approximately 200 meters before the station. However, communication gaps appear to have existed between the train lookout and the relay lookouts, who were unable to contact the train lookout during the operation. A relay lookout reportedly stated, "I was in a situation where I could not communicate with the train lookout," though the precise details of these communication failures remain under investigation.

The incident has raised questions about adherence to safety procedures and the effectiveness of communication among safety personnel during track work. Authorities continue to examine the sequence of events and conditions leading to this fatal accident.