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The Siemens IGBT inverter was used in the 3rd, 4th, and 5th batches of the 1000 series, replacing the Siemens GTO inverter (commonly known as the Do-Re-Mi inverter) used in the Keikyu 2100 series and the 1st and 2nd batches of the 1000 series. Due to its unique sound, it is also called the "scream inverter" or "screaming train." Four 8-car trains (1041F, 1049F, 1057F, 1065F) and eight 4-car trains (1417F to 1445F) were manufactured, but as of October 2021, one 8-car train (1065F) and six 4-car trains have had their equipment upgraded, leaving only three 8-car trains and two 4-car trains (1441F, 1445F). Of these, the 8-car train 1057F is the Yellow Happy Train, with a yellow body, and its operation is published on the Keikyu official website, making it easy to capture. https://www.keikyu.co.jp/ride/train/k... Front view of the 1041F Limited Express bound for Aoto, from Misakiguchi to Aoto. Keikyu's weekday timetable was revised on October 18, 2021, and the Keikyu Kurihama-Misakiguchi section now operates every 20 minutes during the day, so the train stops at Keikyu Kurihama for 10 minutes (transfer at Kurihama 0 minutes to connect to the first Limited Express bound for Sengakuji). Cab view of Keikyu 1000 series from Misakiguchi to Aoto. https://en.wikipedia.org/wiki/Keikyu_...