Measurement of Face-touching Frequency in a Simulated Train Kentaro Morita, Kaho Hashimoto, Masayuki Ogata, Hitomi Tsutsumi, Shin-ichi Tanabe and Satoshi Hori E3S Web Conf., 111 (2019) 02027 Published online: 13 August 2019 DOI: 10.1051/e3sconf/201911102027