One summer job is putting some cash in the pockets of helpful teens, and making sure commuters keep cool while they ride the rails.

Every summer, Metro-North Railroad hires 25 student interns to serve as "air conditioner inspectors." Their job is to ride the trains and make sure everything is comfortable for the thousands who take the train each day.

One teen, Michael Gurdineer, tells The Advocate, "It's got to be about 88 degrees," as he rides one rail car. He grabs his electronic thermometer, hits the start button and waits for the verdict on the digital screen. It's 86.9 degrees. "I'm going to have to make a call about this one."

According to the paper, Gurdineer rides about eight trains a day, testing each car's temperature to determine whether it's cool enough for commuters. Gurdineer waits until the train leaving Grand Central Terminal arrives at Harlem-125th Street - allowing the rail cars time to be outside in the sun - so he can get a fair reading.

According to the system, any car running at or above 90 degrees is likely to be pulled from service.

Michael Stoto, superintendent of Metro-North's heating ventilation air conditioning unit explains, "Because of the number of passengers, the constant opening and closing of doors, and the amount of heat given off by the engines, a single rail car's air conditioning unit must be powerful enough to cool about six homes."