A 2-year-old boy accidently rolled his little brother's stroller off a subway platform Friday and tumbled after him to the tracks, but a zoo worker and a homeless man snatched them to safety as a train roared toward them.

The two men leaped onto the tracks in a Harlem subway station after the boy pushed the stroller carrying his 1-year-old brother onto the tracks and fell behind him, said Transit spokesman Al O'Leary."It happened just as his mother turned away to help an elderly lady on the platform," O'Leary said. Devon Smith, 2, suffered a concussion, and his younger brother, Ceseare George, suffered bruises when he landed with his stomach across a rail in the 10 a.m. incident.

Johnny Mathis, 39, a night watchman at Central Park's Children's Zoo, said he jumped to the tracks and, with a homeless man - Melvin Little - who joined him, lifted the bloody toddlers to safety and climbed up as a train approached.