Railway vehicle and associated traffic method

A railway vehicle comprising at least one car and at least one bogie carrying the car, the bogie comprising a chassis and a secondary suspension system between the chassis and the car, the secondary suspension system, comprising:

• a set of springs mounted between the chassis and the car;
• a jack comprising two ends extending along a same axis;
• and
• a power supply system of the jack;
• wherein the jack is configured to go from a first so-called retracted configuration in which the jack is only connected to the car by the first end of the jack, to a second so-called deployed configuration in which the jack is also connected to the chassis by the second end of the jack, the power supply device being configured, in the deployed configuration, to supply the jack so as to move the car away from the chassis or to keep the distance between the car and the chassis constant,
• the first end of the jack being connected to the car by a knuckle joint-type connection.