Chainsaw robot for infrastructure maintenance

The Japanese railway company JR East has deployed the ZIZAI ZX-3 robot to remove overgrown branches that could interfere with train traffic. Delivery of the machine from the manufacturer Nippon Signal took place this year, and in October the system began full-scale operation on the Koumi Line in central Japan. Earlier, in July 2024, a similar robotic system was put into use by JR West.

The device is mounted on specialized maintenance rail transport. One mechanical arm of the robot holds the branch, while the second operates a chainsaw. This makes it possible to perform hazardous tasks at great heights without the need to send people there with heavy equipment. At the same time, the machine does not operate autonomously: all movements and the start of cutting are remotely controlled by a qualified operator.

The need to use such machinery is related, among other things, to the shortage of qualified personnel in Japan and the risks of working near electrical infrastructure. Since 2002, JR East has been partially shifting such tasks to daytime hours, which sometimes requires the temporary cancellation of trains for safety reasons and to improve working conditions for employees.

Although the company is exploring artificial intelligence capabilities for inspecting equipment and infrastructure, a timeframe for the robot to transition to fully autonomous operation has not been announced. The developers expect to equip the device with additional tools for other types of maintenance in the future, and similar remotely controlled mechanisms could potentially be used by utility and construction enterprises for vegetation clearance near power lines and in hard-to-reach areas.