Eight thousand and nine hundred train and subway passengers were observed in the autUmn of 1999, The observers included 32 trained female college students . In 1987, we observed 7 , 820 people and in 1997 , 5 , 602 people , This stUdy was performed using the same methods . The data were compared with the past two setS of data that were collected previously ( 1987 and l997 ) . Though other items were observed , this report fbcuses only on the actMty people did while on trains and subways . Forty

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... point n e percent of the tota且number of subjectS observed in 1999 were engaged in some activity. In l 997, this percentage was 32. 7 % , and it was 31. 9 % in 1987. Reading was the most common work − related activity. Howeve ら in I999 the most common activities involved, ce1Mar phone, and computers , , etc . , other than read 血 g which increased to 16 . 9% in 1987 , 28 . 3% in 1997 , and 33. 1% inl999.