This is intended to be placed in an interrupted space of two rails turnout one another and that belong to two different tracks. It is characterised in that it includes in principle an immobilised support cradle (1) that has a central space (7) and several end rail sections (10-11) converging towards this central space (8) and aligned with the rails (3-4) of the turnout a transversally moveable movable point (8) being located in this central space (7) that can be placed stably in two end side positions to align using its side rolling portions (12) with one of the end rail sections (10 or 11), there also being several transversal guides (9) used to move and facilitate the movement of the movable point (8) to its end stable side positions.