2006, and entered service on the Tokyo Metro Yurakucho Line and Tobu Tojo Line in September 2006, allowing four 07 series sets to be transferred to the Tozai Line to replace the remaining 5000 series sets. 10000 series sets entered service on the Seibu Line in February 2007. At the start of Fukutoshin Line services in June 2008, a total of 22 sets had been delivered. And as of 1 April 2015 the fleet consists of 36 ten-car sets. 8-car 10000 series sets entered service on the Tokyu Toyoko Line and Minatomirai Line from 7 September 2012. These 8-car sets were subsequently reformed back into 10-car sets. From April 2016, the original three-colour LED destination indicator panels on some sets were replaced with full-colour LED indicator panels. Gallery References External links Tokyo Metro 10000 series information Tokyo Metro 10000 series (Japan Railfan Magazine Online) Electric multiple units of Japan 10000 series Hitachi multiple units Train-related introductions in 2006 1500 V DC multiple units of Japan