Limited Express Ayame (あやめ) is operated between Tokyo (東京) and Choshi (銚子), Kashima-Jingu (鹿島神宮). Choshi is well know as home of soy sauce and fishing port. Kashima-Jingu is one of the most famous shrine in Japan.
Limited Express Shiosai (しおさい) is operated between Tokyo (東京) and Choshi (銚子), Naruto (成東), Sakura (佐倉). Choshi is located at the mouth of Tone river. This city is very well know as home of soy sauce. And also Choshi is one of the biggest fishing port. There are lots of fresh seafood, like sardines, bonito, and tuna.
Sobu-Yokosuka line (=横須賀総武線) means the operation route of one of the Rapid train network in Greater Tokyo. This train is operated on Sobu line, Tokaido line and Yokosuka line. Most of trains are operated between Chiba (=千葉) and Kurihama (=久里浜)/Yokosuka (=横須賀) via Tokyo (=東京) and Yokohama (=横浜). Some trains are extended to operate to Narita airport (=成田空港) and other stations in Chiba Pref. This train is a sort of commute train. But all trains have two double decker Green cars in the formation. Especially Rapid train to Narita airport may be replacement of Narita Express if you want to save the fare. These trains are fully covered by Japan Rail Pass. Of course if you use Japan Rail Pass Green, you can take Green cars with no extra cost.
Japan Railway operate Rapid trains throughout Japan. Especially lots of Rapid trains are operated in urban area, such as Greater Tokyo. In Tokyo, these trains are operated basically for commuters. But there are many operation routes. Of course you can use these trains for your exploring in surrounding Tokyo area. These trains connect Tokyo (=東京) and Shinjuku (=新宿) with Yokohama (=横浜), Kamakura (=鎌倉), Odawara (=小田原) (for Hakone (=箱根)), Utsunomiya (=宇都宮) (for Nikko (=日光)), Mito (=水戸), Narita airport (=成田空港) and even Atami (=熱海) (Izu peninsula hot springs (=伊豆半島)). These trains are fully covered by Japan Rail Pass. If you have Japan Rail Pass Green, most of Rapid trains in Greater Tokyo have double decker Green cars. You will feel same type of atmosphere in a commute train. Continue reading No express surcharge! Fast, economical and convenient! Rapid service network in Greater Tokyo
Narita Express may be your first train in Japan. It is operated between Narita airport and Greater Tokyo area, such as Tokyo, Shinagawa, Shinjuku, Ikebukuro and Shibuya. And also service is extended to Yokohama, Totsuka, Ofuna and Omiya. This train stops both Terminal 1 and Terminal 2 in Narita airport.