Brake shoe configured to equip a railway braking system comprising a brake linkage, railway braking system provided with such a brake shoe, and railway vehicle provided with such a system

A brake shoe configured to equip a railway braking system for a railway vehicle and to act on at least one braking member of said railway vehicle, including a main plate (116) having an outer face (117) and an inner face (118) opposite to the outer face (117), a mounting member (119) provided on the inner face (118) and configured to receive a complementary member for mounting a lining equipping the railway braking system, and a locking and unlocking mechanism configured to install/remove and lock/unlock the lining onto/from the brake shoe (106), the locking and unlocking mechanism including a locking and unlocking member (123, 223, 323) hingedly mounted with respect to the main plate (116) and extending in a transverse direction of the brake shoe (106), and a safety member (124) mechanically fastened to the main plate (116) and to the locking and unlocking member (123, 223, 323), with the brake shoe configured to assume a locked configuration in which the safety member (124) stresses the locking and unlocking member (123, 223, 323) towards the main plate (116) into a locking position where the locking and unlocking member (123, 223, 323) is configured to be in abutment against the lining, and an unlocked configuration in which the safety member (124) stresses the locking and unlocking member (123, 223, 323) to place it at a first distance from the main plate (116) into an unlocked position where the locking and unlocking member (123, 223, 323) is configured to be at a second distance from the lining, wherein the locking and unlocking member (123) is provided with a gripping portion (150, 280, 390) which projects transversely beyond the main plate (116), and which is configured to move the locking and unlocking member (123, 223, 323) and the safety member (124) together in order to switch the brake shoe (106) from one of its locked and unlocked configurations to the other, when subjected to an external stress.