Railway trolley set for wooden sliding doors. Includes 4-wheel trolleys with ball bearings and all mounting elements. The mechanism allows height adjustment of ±5 mm and includes an anti-unhooking lock and a bi-directional soft-close system. In addition, the stop brake does not require machining prior to installation on the rail. The same mechanism works for both opening and closing. The parts are made of steel, plastic, and zamak, of proven quality. One model is available with a 40 kg load support and one with an 80 kg. For either model, the packaging is offered per unit.