Railway car and bogie of railway car

A bogie of a railway car that supports a subframe with a clearance therebetween and the subframe supporting a car body with a clearance therebetween, said railway car comprising:

• a subframe disposed below the car body supporting said car body with a clearance therebetween;
• a bogie disposed below said subframe with a clearance therebetween;
• wherein
• said subframe is capable of traveling in synchronism with said car body in the direction of travel of said car body;
• said car body and said subframe are connected via a first center pin protruding downward from said car body or a first center pin protruding upward from said subframe toward said car body;
• said subframe and said bogie are connected via a second center pin protruding downward from said subframe or a second center pin protruding upward from said bogie toward said car body;
• said car body is capable of rotating freely in a width direction with a center of rotation corresponding to a longitudinal direction of the car body;
• either both width-direction ends of a lower surface of said car body or both width-direction ends of an upper surface of said subframe are recessed in an arc-shape with a center corresponding to said center of rotation;
• and
• either the upper surface of said subframe or the lower surface of said car body is in contact with said arc-shaped surfaces via rollers.