東急５０５０系４０００番台（清瀬→武蔵小杉）｛東急線内急行｝【全区間走行音】

東武５０５０系４０００番台、清瀬始発各駅停車武蔵小杉行きです。東急線内は急行です。西武池袋線から東急東横線への旅をお楽しみ下さい。途中、東新宿で急行の通過待ちがあります。車内環境はフラット音があり不良です。（２０１６年７月録音）｛車両：４９０１｝ This is a Tobu 5050 series 4000 subseries train, a local service bound for Musashi-Kosugi, departing from Kiyose. This train will operate as an Express within the Tokyu Line. Please enjoy your journey from the Seibu Ikebukuro Line to the Tokyu Toyoko Line. There will be a wait for an express train to pass at Higashi-Shinjuku Station along the way. The in-car environment is poor due to flat spots on the wheels causing noise.