JR Central launches passenger-run inspection train “Dr. S” on Tokaido Shinkansen

Central Japan Railway Co. has introduced the “Dr. S” train on the Tokaido Shinkansen, offering regular passenger service while the unit is tested for future inspection duties. It succeeds a Doctor Yellow train retired earlier last year and will be equipped for full rail and overhead-line inspections starting January 2027. The fleet will consist of four sets, with two dedicated to rail-surface checks and two to overhead-line surveillance.

The design replaces the laser-based measurement system of earlier inspection trains with under-carriage sensors, allowing the passenger cabin to remain unchanged. Overhead-line faults are detected via sensors and cameras mounted on the pantographs, and onboard AI analyses the footage to identify trees or bird nests that could threaten the wires. This approach aims to streamline maintenance while keeping the train usable for commuters during the transition.