31.   He talked about putting conductors back on London buses and guards back on the subway trains.

32.   He was able to walk away easily on Christmas Eve and remained free until he pushed Soon Sin in front of a moving subway train on Wednesday.

33.   He said he spent it on a subway train.

34.   His mother, who had taken a bus and three subway trains to get to the hospital, lost her pay that day.

35.   I want to ride on a subway train.

36.   I plot my days to squeeze in a morning ride on the D subway train heading west across the Manhattan Bridge.

37.   If you waited long enough, your subway train would come.

38.   In Brooklyn, N.Y., it felt as if the subway train were rolling by.

39.   In the Bronx, subway trains travel above ground and, where they pass near a school, the effects are calamitous.

40.   In Washington, Metro subway trains were running but not stopping at the Pentagon or Ronald Reagan National Airport.