The Sōbu Line (Rapid) (総武快速線 Sōbu-kaisoku-sen) is a railway service on the Sōbu Main Line in Tokyo and Chiba Prefecture, Japan, operated by East Japan Railway Company (JR East). It connects Tokyo Station in Chūō, Tokyo with Chiba Station in Chūō-ku, Chiba via the cities of Ichikawa, Funabashi, and Narashino.
Rapid services on the Sōbu Line are primarily operated between Tokyo and Chiba, although there are many through services onto the Yokosuka Line as well as some through services operated from the Yokosuka Line via Tokyo terminating at Tsudanuma. During weekday morning peak periods Tokyo-bound trains arrive once every 3–4 minutes; this is reduced to 10 Chiba-bound trains per hour during weekday evening peak periods. At other times there are approximately six trains per hour. There are many through services operated onto other lines. In addition, there is an hourly Airport Narita rapid service that runs to Narita Airport, complementing the non-stop Narita Express service.
Commuter rapid trains, operated during weekday peak periods in the mornings and evenings, make fewer stops that normal rapid trains. There are two Zushi-bound trains from Narita in the morning and a single Narita-bound train from Tokyo in the evening.
There are five Home Liner Chiba commuter liner services that operate every weekday evening, four of which start from Tokyo and another which starts at Shinjuku. It stops at the stations shown in the list below (the service departing from Shinjuku stops once at Akihabara).
|Shin-Koiwa||新小岩||5.2||10.0||●||｜||｜||Chūō-Sōbu Line (JB25)||Katsushika|
|Ichikawa||市川||5.4||15.4||●||｜||｜||Chūō-Sōbu Line (JB27)||Ichikawa||Chiba|
|Inage||稲毛||9.2||35.9||●||｜||●||Chūō-Sōbu Line (JB37)||Inage-ku, Chiba|
Note: Special Rapid service was discontinued on 4 March 2017.
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