Set number 4110 was delivered in April 2013 in a special "Shibuya Hikarie" body graphics and with modified interior to mark the first anniversary of Tokyu's "Shibuya Hikarie" development located above the newly expanded underground Shibuya Station. This trainset entered revenue service on 26 April 2013. It is the first 5050 series train to feature LED interior lighting, and has higher backed seating than regular trains, with grey seat backs in cars 1, 3, 8, and 10, brown seat backs in cars 2, 4, 6, and 9, and blue seat backs in cars 5 and 7. The train is equipped experimentally with free WiFi. One stanchion in the train features an embossed heart design as a whimsical way to brighten up commuters' journeys. Nine cars of the first set were delivered from Tokyu Car's Yokohama factory to Tokyu's Nagatsuta Depot in Kanagawa Prefecture between 29 and 31 March 2011. These cars were formed into a 10-car set with the inclusion of intermediate motor car 4601, renumbered from former 5050 series trailer car 5469, which was itself previously renumbered from motor car 5918. The second 10-car set was delivered from Tokyu Car in June 2011. Set 4101 entered revenue service on the Tokyu Toyoko Line from 9 September 2011, reduced to an 8-car formation. From 10 September 2012, 10-car 4000 series sets entered revenue service on the Seibu Ikebukuro Line (and Seibu Yurakucho Line) and Tobu Tojo Line, with inter-running through to the Tokyo Metro Fukutoshin Line and Tokyo Metro Yurakucho Line. Ten six-car sets were introduced on the Meguro Line from March 2003. These sets are distinguished by a dark blue stripe above the doors. Unlike the other variants, they are powered by Toshiba equipment, rather than Hitachi. The 5080 series is fitted with CS-ATC, ATO and TASC for use on the Tokyo Metro Namboku Line, Saitama Rapid Railway Line, and Toei Mita Line. These sets are based at Motosumiyoshi Depot. Meguro Line six-car sets are formed as follows, with three motored (M) cars and three trailer (T) cars. Car 1 is at the Meguro end. The M1 cars (5) are fitted with two single-arm pantographs, and the M cars (2) are fitted with one.