He tried to stop Q train horror

Witness in B’klyn station shouted at conductor on subway dragging vic

As a man was fatally dragged off a subway platform by a Q train in Brooklyn late Wednesday, a witness shouted for the train’s conductor to hit the brakes.

Yau Kin Lau, 31, recounted the gruesome scene to the Daily News on Friday, saying the victim — identified as Marcus Bryant — was dragged 30 or 40 feet across the platform before he fell to the tracks below. The train kept rolling as Lau’s cries for help went unheard.

Lau said he exited the train at the Avenue M station around 11:50 p.m., one or two cars in front of Bryant (photo), who was in the final car of the train.

“When the train goes off I heard him scream and yell for help,” said Lau. “At that moment the train just didn’t stop at all because no one realized it. I ran towards it and shouted for help, but no one heard anything.”

Lau said he called 911 and ran to the station’s token booth to ask the clerk for help.

Another train rolled through the station three minutes later and ran over Bryant, 37, said police. His left arm was severed and part of his left leg was torn off — but police said he was alive when he was transported to Maimonides Hospital, where he died later that night.

Less than two days later, Lau was still visibly shaken by the gruesome incident, saying he wished he’d been on the platform to flag down the second train before it ran over Bryant.

“Nighttime usually it takes 10 to 15 minutes [between trains],” he said. “I thought of a few scenarios. I could jump down and save him but I’m not a big-sized person. Maybe take a cell phone, the flashlight [to shine at the oncoming train]. Running down was the best option I could think of at the moment.”

It remained unclear Friday exactly how Bryant was dragged by the train. MTA and NYPD officials said they have surveillance video of his fall, but declined to release the footage because the incident remains under investigation.

Transit sources with knowledge of the video said Bryant walked off the train onto the platform, but stepped back and stood near the door as it closed. A source said it appeared he was dragged by the metal step that protrudes from some train cars near each door.

“Of course I wish to know what makes his legs stuck between the platform and the train,” said Lau. “We’re riders, we take the train all the time. This is New York. Subways are our life.”

The NYPD on Thursday initially reported Bryant’s clothing — and possibly his leg — got stuck in the train’s door as it left the station. Metropolitan Transportation Authority officials later disputed that assessment, and said he instead got caught between the train and the platform.

Initial reports from police also stated that the second train was able to stop before striking Bryant.

MTA sources said the train’s doors were tested following the accident and found to be working as designed. Transit sources also said Avenue M is known to be a “deep gap” station, with relatively large spaces between train doors and platforms.

Bryant’s family declined comment on Thursday.