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In page Musashino Line:

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The first section of the line between Fuchū-Hommachi and Shin-Matsudo opened on 1 April 1973.[2] Train services were operated using 6-car 101-1000 series EMUs, which were modified specially for the line to comply with government regulations concerning fire resistance of trains operating through long tunnels, as the line included the 4,380 m (14,370 ft) Higashi-Murayama Tunnel (東村山トンネル) between Shin-Kodaira and Shin-Akitsu stations, and the 2,563 m (8,409 ft) Kodaira Tunnel (小平トンネル) between Shin-Kodaira and Nishi-Kokubunji stations.[1] Services operated at 15-minute intervals in the morning peak, and at 40-minute intervals during the daytime off-peak.[1]