A teenager was critically injured after subway surfing in the Bronx, and a young woman lost her life when she was fatally struck by a train in Manhattan. These tragic incidents unfolded within the city’s subway system on Monday, as reported by the police.

The teenage boy fell onto the tracks at the Baychester subway station while riding on top of a northbound 5 train shortly after 4 p.m., according to authorities.

Paramedics rushed to the victim, who police said is between 14 and 16 years old, to Jacobi Hospital.

He was listed in critical condition, according to the NYPD.

Later Monday night, a 24-year-old woman was struck and killed by a northbound L train at the Union Square subway station, cops said. 

Witnesses told officers that at around 10:20 p.m., the woman jumped down onto the tracks of her own accord.

But when the northbound train was pulling into the station, she scrambled to climb out, police said witnesses saw. 

She didn’t make it in time and was hit.

Paramedics pronounced the victim dead at the scene at 10:27 p.m., police said.

The reason for her jumping onto the tracks is unknown. The incident is still being investigated, but investigators currently do not suspect any criminal activity. 

L train service between 8th Avenue and Bedford Avenue was suspended for about an hour, and then partially restored. Delays along the line continued into the early hours of Tuesday morning, according to an MTA spokesman.