The incident was captured on video, as Meera Thakrar, carrying her 4-year-old son, stepped right off the platform and landed the tracks, not too far from the electrified third rail.
"I was just rushing, thinking that, 'Oh that's the train I'm boarding,' but that train was on the other platform, it was not on this platform," Thakrar said.
"I've decided I will not be accessing any trains," she said. "I would rather pay $25 parking in Boston, but I will not be getting on the subway."
Fortunately, Thakrar and her son were not badly hurt in the fall.