Hundreds of people are struck by MTA trains each year — but the dead and the wounded are not the only victims of the tragedies.

Motormen are the first to see the horrific collisions, are usually helpless to prevent them from happening, and then must go down on the tracks to determine the victim’s condition, leaving many with lasting psychological issues.

Some are even unable to return to work because of the horror they experience.

In 2008, Jermaine Dennis had been a train operator for less than two years when a woman jumped in front of his train as he was pulling into the North Conduit Avenue station on the A line in Queens.

“I put [the train] into emergency, and pulled all the brakes, but it was too late,” recalled Dennis, 44. “She was under the fourth car. I ran over her, and she had hit the running rail. There was blood dripping from her head and coming down her face.”

Dennis was in shock, but he still had to deal with the situation. Everyone on the platform was crying and yelling, and he had to comfort them and also get them to stop taking photos of the nearly dead woman. He waited for emergency personnel, who took the woman to the hospital, where she died.

Afterward, Dennis’ life became a disaster. He swears he saw the woman’s ghost the first night after the incident.

“There was a lightning storm, and I couldn’t sleep,” recalled Dennis, who told The Post how he wanted to be a train operator for as long as he could remember and, as a little kid, positioned himself in the front car of the subway so that he could look out the front window and see what the motorman was seeing.

“I had a vision of her in a white dress, staring at me. It was her ghost,” the shaken man said.

The MTA eventually sent Dennis to see a psychologist, but it was months before he could even step foot into a subway station again.

Dennis was finally able to get back to work, but he spent several months going slower than he was supposed to as he approached each station.

Then this year, a drunken man stumbled as Dennis’ train was pulling into the station, and the man got caught between the cars and platform. He lived, but his arm was badly mangled.

“I just had to follow the blood to find him,” Dennis said.

The past few weeks have been particularly bad for train operators. Several maniacs have pushed people onto the tracks — including one fatally — and as usual, several distraught New Yorkers have jumped in front of trains.

So far this year, 142 people have been struck by trains, and 44 of those were fatal, according to MTA officials.

The Transport Workers Union, which represents MTA workers, said the agency needs to take more steps to keep people from being hit by trains.

Motormen know there is little they can do to stop a person from smacking into the front of their train or getting run over, Earl Phillips, a secretary at TWU 100.

“Some of them have seen two or three or four [accidents],’’ Phillips said. “Their families are the ones that hear them screaming in the night. They get flashes of it, and they can’t rest properly.”

The union wants the agency to hurry up and add a “track intrusion” system that uses thermal-imaging cameras, laser-beam transmitters and other high-tech tools to alert motormen if someone falls on the tracks up ahead.

The system is in place in only one secret location, said agency spokesman Kevin Ortiz. The MTA plans to install it in a second station next year.

The union would also like the MTA to allow trains to move slower when approaching stations.