raw video ( no audio) PORTLAND - A terrifying experience for a Portland father as he and his son are separated by the closing doors of a MAX train, leaving the son on the platform and the father stuck on the train.Tonight the dad is furious.TriMet tells us they are still trying to find out exactly what happened on board the northbound Green Line train, but what is certain, dad is not happy and says his emergency was ignored by the train operator."I thought the doors were going to close on my arm, so I let him go," said the father, Aaron Bailey.In surveillance video you can see the 3-year-old, Aiden Bailey, left the Green Line train."You're son's on one side of the train and you're on the inside and if that gal hadn't been there you can only imagine what would have happened," said Bailey.Aiden stayed with the stranger as his dad tried to get off the train and back onto the platform."I could not get off that train, those doors would not open when I pushed that button repeatedly," Bailey added.Bailey admitted his son pushed the wheelchair ramp button. When pushed it is supposed to close the train doors, extend the wheelchair ramp, and then reopen the doors. But the doors never reopened for Aaron."They can say it's a malfunction, but likely it's not, in my opinion," said Bailey.Bailey believes he was ignored by the train operator, even after he repeatedly pushed the emergency call box."Of course it was ignored there was no answer on the other end, he did not take responsibility for his passengers," said Bailey.TriMet couldn't provide KOIN Local 6 many answers as to what happened, including whether it was a malfunction or an operator error."We're still investigating all the different things. We're investigating the door, the ramp, and the audible system," said Mary Fetsch, a TriMet spokesperson.You'll see in the surveillance video that Bailey was reunited with his son after a tense and frightening 7 minutes.Aiden was safe and he's learned a very valuable lesson."You going to push another button again?" Bailey asked of his son, Aiden, who shook his head no.This all happened on one of TriMet's Type 4 Max trains, the newest in their fleet.TriMet says they will inspect all of their Type 4 trains to find out if it is a problem with the trains' emergency call boxes or wheelchair ramps.