A railway vehicle having a variable trim body, comprising two bogies with respective frameworks and swinging transverse members, articulated connection levers between each swinging transverse member and the body, and a body roll control system to perform, while the vehicle is running along a curve, rotations of the body around a longitudinal axis so as to limit the non-compensated centrifugal acceleration acting on the body. The control system employs linear double-effect actuators acting on the articulated connection levers, whereby the body rotations are operated by virtue of the rotations of these levers.