A valve assembly is dimensioned for interconnection between a pressurized gas supply system and a pressurized gas braking system of a rail vehicle. The valve assembly can include a valve housing and a valve body. The valve housing can include a housing wall that at least partially defines a housing chamber and includes a plurality of communication ports in fluid communication with the housing chamber. The valve body is supported within the housing chamber for sliding movement relative to the housing wall. The valve body can be displaced between a plurality of positions in which different ones of the communication ports are in fluid communication with one another. A pressurized gas system and a rail vehicle are also included.

A vehicle braking system includes brakes, a body, a braking linkage, a service brake comprising a braking piston movable relative to the body to act on the braking linkage and delimiting a service brake pressure chamber to place the braking piston in a service braking position. A parking brake acts on the braking piston and has a working configuration and a resting configuration. The parking brake includes a blocking device movable relative to the body to act on the braking piston and having a first position and a second position in which the blocking device is configured to immobilize the braking piston in a service braking position. A control device is movable relative to the body and has a locking position to hold the blocking device in the second position. A service brake indicator device receives information representing supply and/or venting of the service brake pressure chamber.

In a railway vehicle, a brake control device controlling a first brake device that presses a friction material against a wheel and a second brake device not using the friction material includes: a wheel load estimation unit estimating a wheel load-based on a wheel speed and a brake force applied to the wheel by the friction material; a friction surface state quantity estimation unit estimating a current friction coefficient of the friction material from a state of a friction surface thereof based on the wheel load, the wheel speed, and a brake force command, and outputting a mirror-surfacing signal indicating the friction surface is in a mirror-surfaced state when the friction coefficient is less than a first threshold value; and a brake control unit controlling operations of the first and second brake devices based on the brake force command and presence or absence of the mirror-surfacing signal.

A locking device configured to manually release a parking brake in a brake actuator for rail vehicles, the locking device including a spindle drive including a teething; a locking element engaging the teething of the spindle drive and switching a rotating movement and thus an axial force transmission of a parking brake on or off; and at least one contact damping element configured to dampen or prevent a contact of the locking element.

A compressed air distribution system for a vehicle (e.g., rail vehicle) includes first and second reservoirs and first and second compressors. The first and second reservoirs are configured to contain respective compressed air to be supplied to first and second braking systems of the vehicle. The first braking system is configured to apply a first braking force to a first wheel set of the vehicle with the compressed air received from the first reservoir, and the second braking system is configured to apply a second braking force to a second wheel set with the compressed air received from the second reservoir. Each wheel set includes a respective axle and a respective one or more wheels coupled to the axle. The first and second compressors are configured to generate compressed air to be stored in the first and second reservoirs, respectively.