There is provided a three-axle truck for a railcar having three wheelsets in a truck frame of the one truck, in which in each of the wheelsets, axle boxes are supported by the truck frame through axle springs, the truck frame has a structure for supporting a carbody whose weight is variable, and making variations in axle loads on the respective wheelsets be maintained at a preset value or less in spite of change of the carbody weight, and in this structure, spring constants of the both-end axle springs in the respective wheelsets located at both ends of three axles are set to be larger than a spring constant of the middle axle spring of the wheelset located in the middle.

A wheel set intermediate frame for a rail vehicle includes a plurality of mounting interfaces for chassis components at predetermined positions. Part of the wheel set intermediate frame for a rail vehicle is also at least one defined mounting interface for fixing to a subframe of a car body of a rail vehicle. A rail vehicle and a method for producing a wheel set intermediate frame for a rail vehicle are also provided.

A wheel set intermediate frame for a rail vehicle includes a plurality of mounting interfaces for chassis components at predetermined positions. Part of the wheel set intermediate frame for a rail vehicle is also at least one defined mounting interface for fixing to a subframe of a car body of a rail vehicle. A rail vehicle and a method for producing a wheel set intermediate frame for a rail vehicle are also provided.

A rail structure of steel rail track and steel wheel vehicle includes a track and a vehicle, wherein the track comprises: two main steel rails, one or two auxiliary rails, or no auxiliary rails, and a turnout; the main steel rails and the auxiliary rails form a ballastless track or a ballasted track; the vehicle comprises: a vehicle body, a main steel wheel, an auxiliary rail guide wheel, and an auxiliary rail action component; the main steel wheel has or has no wheel flange, the tread is a cylindrical surface, and the left and right main steel wheels are independent rolling wheel pairs, not rigid wheel pairs; the main steel wheel rolls on the main steel rail, supports the weight of the vehicle, and drives and brakes the vehicle.

A rail structure of steel rail track and steel wheel vehicle includes a track and a vehicle, wherein the track comprises: two main steel rails, one or two auxiliary rails, or no auxiliary rails, and a turnout; the main steel rails and the auxiliary rails form a ballastless track or a ballasted track; the vehicle comprises: a vehicle body, a main steel wheel, an auxiliary rail guide wheel, and an auxiliary rail action component; the main steel wheel has or has no wheel flange, the tread is a cylindrical surface, and the left and right main steel wheels are independent rolling wheel pairs, not rigid wheel pairs; the main steel wheel rolls on the main steel rail, supports the weight of the vehicle, and drives and brakes the vehicle.

A bi-directional railroad-track to maglev-guideway transition system includes a portion of a railroad track having two parallel rails defining a first axis of travel, and a portion of a maglev guideway defining a second axis of travel. In the transition system, the portion of the maglev guideway is adjacent to the two parallel rails of the portion of the railroad track with a non-zero elevation grade being defined between the first axis of travel and the second axis of travel.

A bi-directional railroad-track to maglev-guideway transition system includes a portion of a railroad track having two parallel rails defining a first axis of travel, and a portion of a maglev guideway defining a second axis of travel. In the transition system, the portion of the maglev guideway is adjacent to the two parallel rails of the portion of the railroad track with a non-zero elevation grade being defined between the first axis of travel and the second axis of travel.

In a railcar truck in which secondary springs are disposed between the railcar truck and a carbody of the railcar, the railcar truck has a pair of side beams having concavities configured to receive the secondary springs. Each of the side beams has a side beam outer wall, a side beam inner wall, a side beam lower wall and a side beam upper wall, and the side beam upper wall includes an opening through which the received secondary spring projects. The concavity is formed by the side beam outer wall, the side beam inner wall and the side beam lower wall, and receive the secondary spring through the opening.

In a railcar truck in which secondary springs are disposed between the railcar truck and a carbody of the railcar, the railcar truck has a pair of side beams having concavities configured to receive the secondary springs. Each of the side beams has a side beam outer wall, a side beam inner wall, a side beam lower wall and a side beam upper wall, and the side beam upper wall includes an opening through which the received secondary spring projects. The concavity is formed by the side beam outer wall, the side beam inner wall and the side beam lower wall, and receive the secondary spring through the opening.