Abstract: The basic removal coefficient and additional removal coefficient of speed-up passenger trains on single railway lines are analyzed by taking Hankou-Danjiangkou railway line as the background. When the speed of freight trains is as it is and that of passenger trains is about 120 km/ h, the removal coefficient is between -0.045 and -0.136, the speed-up of passenger trains results in a rise in removal coefficient by 0.2 to 0.7, and a speed-up train passing over another causes an increase in removal coefficient by 0.05 to 0.10. Generally, the removal coefficient of speed-up of passenger trains is about 1.6.