the 07 series fleet has undergone a programme of refurbishment, also known as "class B repair". The programme included the installation of LED lighting throughout, full-colour destination displays, and updated door chimes and flooring. The first set to undergo refurbishment (07-103) returned to service on the Tozai Line on 15 August 2018, and on the Chūō-Sōbu and Tōyō Rapid lines on 25 October of that year. References External links Tokyo Metro Tōzai Line 07 series information Electric multiple units of Japan 07 series Kawasaki multiple units Train-related introductions in 1992 Nippon Sharyo multiple units 1500 V DC multiple units of Japan