PROBLEM TO BE SOLVED: To provide a method for preventing composition buckling of trains caused when vehicles collide and a method for suppressing the swing of a vehicle and to provide a railroad vehicle capable of preventing the occurrence of train composition buckling or reducing yawing and providing satisfactory riding comfort.
SOLUTION: Hydraulic cylinders 12 are provided on both left and right sides across a close adhesion coupler 10. The hydraulic cylinders 12 are arranged obliquely for the forward and backward directions. In this hydraulic cylinder 12, a cylinder main body 13 is attached to a vehicle body underframe 1, and a cylinder rod 14 is attached to the close adhesion coupler 10 on car body front and rear end part sides more than the cylinder main body 13. The cylinder bodies 13 of the left and right hydraulic cylinders 12 are mutually connected by an oil feed pipe 15. A flow rate control valve 17 is assembled on the halfway of the oil feed pipe 15. The flow rate control valve 17 is connected with a controller 19.