On 28th, I saw 4103F set of Tokyu Corporation 5050-4000 Series, which is shortened to 8 carriages, at Nerima Station. It is first time that this unit is shortened since Tokyo Metro Fukutoshin Line going-through service started.
In the present, 4103F set is in service with 2 middle carriages, 4603 and 4703, uncoupled. It was in service consisting of the same 8-carriage before the going-through service started.
This carriage arrangement can be seen as one more 8-carriage unit needed instead of 5155F, damaged in an accident on February 15th.