According to one embodiment, a position observation system includes a sensor and a processor. The sensor is arranged to face a first opening of a through hole included in a first target object. The sensor projects a light beam for scanning the through hole and receives reflection light of the light beam from a second target object that is to be inserted through a second opening of the through hole into the through hole. The processor including hardware. The processor generates an image based on the reflection light received by the sensor, and displays the image on a display device.

An articulated rail coupler comprises a base member, a female connecting member, a male connecting member, a bearing race, a first bearing seated within the bearing race and defining a vertical axis of rotation, and a second or a coupler bearing configured and sized to be received within a truck bogie bearing bowl. The male connecting member is allowed to rotate relative to the female connecting member about the vertical axis of rotation in a range of about ninety degrees, when the male connecting member and the female connecting member are coupled therebetween by the first bearing.

An articulated rail coupler comprises a base member, a female connecting member, a male connecting member, a bearing race, a first bearing seated within the bearing race and defining a vertical axis of rotation, and a second or a coupler bearing configured and sized to be received within a truck bogie bearing bowl. The male connecting member is allowed to rotate relative to the female connecting member about the vertical axis of rotation in a range of about ninety degrees, when the male connecting member and the female connecting member are coupled therebetween by the first bearing.

A centre pivot liner (10) which includes a body (12), and a bearing formation (14) mountable about the body (12) for in use, defining a bearing surface (16) of the centre pivot liner (10) and wherein the bearing formation (14) has a coefficient of friction value less than that of the body (12).

A centre pivot liner (10) which includes a body (12), and a bearing formation (14) mountable about the body (12) for in use, defining a bearing surface (16) of the centre pivot liner (10) and wherein the bearing formation (14) has a coefficient of friction value less than that of the body (12).

Disclosed is a rail vehicle including at least one car and at least one bogie carrying the car. The bogie includes a chassis and a secondary suspension system between the chassis and the car. The secondary suspension system includes a spring assembly mounted between the chassis and the car.The secondary suspension system includes a actuator, provided with a piston extending at least partially between an upper stop secured to the car and a lower stop secured to the chassis, and a supply device of the actuator.The supply device of the actuator is able to supply the actuator such that the distance between the upper and lower stops is kept constant by the actuator.

An articulated rail coupler comprises a base member, a female connecting member, a male connecting member, a bearing race, a first bearing seated within the bearing race and defining a vertical axis of rotation, and a second or a coupler bearing configured and sized to be received within a truck bogie bearing bowl. The male connecting member is allowed to rotate relative to the female connecting member about the vertical axis of rotation in a range of about ninety degrees, when the male connecting member and the female connecting member are coupled therebetween by the first bearing.

An articulated rail coupler comprises a base member, a female connecting member, a male connecting member, a bearing race, a first bearing seated within the bearing race and defining a vertical axis of rotation, and a second or a coupler bearing configured and sized to be received within a truck bogie bearing bowl. The male connecting member is allowed to rotate relative to the female connecting member about the vertical axis of rotation in a range of about ninety degrees, when the male connecting member and the female connecting member are coupled therebetween by the first bearing.

A bogie frame includes a cross beam extending in a car width direction and including a car width direction middle portion at which a center pin arrangement space is formed. The cross beam includes a pair of pipe members extending in the car width direction and lined up so as to be located away from each other in a car longitudinal direction, and air spring seats provided at upper surfaces of car width direction end portions of the pair of pipe members. At least one of the pair of pipe members includes a curved portion at a car width direction middle portion thereof, the curved portion projecting outward in the car longitudinal direction such that a clearance between the pair of pipe members increases. The center pin arrangement space is formed between the pair of pipe members by the curved portion.

A bogie frame includes a cross beam extending in a car width direction and including a car width direction middle portion at which a center pin arrangement space is formed. The cross beam includes a pair of pipe members extending in the car width direction and lined up so as to be located away from each other in a car longitudinal direction, and air spring seats provided at upper surfaces of car width direction end portions of the pair of pipe members. At least one of the pair of pipe members includes a curved portion at a car width direction middle portion thereof, the curved portion projecting outward in the car longitudinal direction such that a clearance between the pair of pipe members increases. The center pin arrangement space is formed between the pair of pipe members by the curved portion.