The MBTA Transit Police said a 12-year-old boy was injured in a fall while trying to "train surf."
Shortly before 1 a.m. Tuesday, the child tried to ride atop a Red Line train car that originated from the JFK-UMass stop in Boston's Dorchester neighborhood, authorities said.
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WATCH HEREHe suffered a serious but non-life-threatening head injury.
Transit police said they hope the child makes a full recovery, but warned the public about "the inherent extreme danger of 'Train Surfing.'"
"It could literally cost you your life," MBTA Transit Police Superintendent Richard Sullivan said in a statement.
