What are the advantages and disadvantages of ballasted track and ballastless track?

What are the advantages and disadvantages of ballasted track and ballastless track

Ballasted track refers to the use of slag as the roadbed on top of the roadbed, the slag is the stone, the requirements of which is the structure of the uniform, hard, weathering resistance, impact toughness, elasticity, and is conducive to the drainage of the characteristics. Ballastless track refers to no stone on top of the roadbed, but the use of integral roadbed plate, roadbed plate is prefabricated in the back of the factory. Generally 3 meters wide and 5 meters long. Reinforced concrete construction. The fasteners for the rails will be pre-buried in it when prefabricated. Ballastless track in China is generally used in passenger dedicated line. That is, high-speed railroad. Characterized by high construction speed and fast laying speed. Train running more smoothly. But at the same time the cost is high