About seven cars of a non-stop train, imported from China two years back, derailed in eastern Pakistani province of Punjab and plummetted into a 50 to 60 feet deep ravine on Sunday, police and railway officials said. A non-stop train was heading toward Lahore city from Rawalpindi, when its seven cars derailed in a complex mountainous area near Jehlum city, about 150 kilometers from Islamabad, and plummetted into a ravine, the police officials told KUNA. According to a senior railway official, who was on his way to the disaster site, said about 621 passengers were aboard the train. He, fearing the accident may turn into a big disaster, said about 400 passengers were jammed packed into the unfortunate train cars.Meanwhile, a journalist, Muhammad Nawaz, calling from the accident site said that over 50 passengers were feared to have died in the accident and more than 100 wounded. He said dozens of ambulances had reached the scene and rescuers and military troops were trying to rescue the unfortunate passengers. He said nothing was visible because of night darkness, adding, people and rescuers who gathered at the site could hear only hue and cries of women and children.