In this image made from a Friday, Nov. 6, 2009 surveillance video provided by the Massachusetts Bay Transportation Authority, an unidentified woman stumbles before falling onto the subway tracks at Boston's North Station. The woman suffered some scrapes and was taken to a hospital for evaluation. She told authorities she had been drinking.

In this image made from a Friday, Nov. 6, 2009 surveillance video provided by the Massachusetts Bay Transportation Authority, people try to flag down an approaching train after an unidentified woman fell onto the tracks at Boston's North Station. The woman suffered some scrapes and was taken to a hospital for evaluation. She told authorities she had been drinking.

In this image made from a Friday, Nov. 6, 2009 surveillance video provided by the Massachusetts Bay Transportation Authority, an unidentified woman stumbles before falling onto the subway tracks at Boston's North Station. The woman suffered some scrapes and was taken to a hospital for evaluation. She told authorities she had been drinking.

In this image made from a Friday, Nov. 6, 2009 surveillance video provided by the Massachusetts Bay Transportation Authority, an unidentified woman lies on the subway tracks at Boston's North Station after falling off of the platform. The woman suffered some scrapes and was taken to a hospital for evaluation. She told authorities she had been drinking.

In this image made from a Friday, Nov. 6, 2009 surveillance video provided by the Massachusetts Bay Transportation Authority, a subway train comes to a stop just before running over an unidentified woman who fell on the tracks at Boston's North Station. The woman suffered some scrapes and was taken to a hospital for evaluation. She told authorities she had been drinking.