To identify the vibrational characteristics influencing motion sickness in trains, a poll for approximately 4,000 passengers was undertaken and the train vibrations were measured on 52 commercial routes. The subject trains were comprised of 14 varieties of Limited Express trains. Among them, eight types were tilting trains and the other six were non-tilting conventional trains. The ratio of passengers who felt motion sickness in tilting trains was higher than those in non-tilting trains. Low frequency lateral motion in the range 0.25 to 0.32 Hz highly influenced the degree of motion sickness. Consequently, a new frequency-weighting curve to evaluate the susceptibility of motion sickness was proposed.

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