Working vehicle (1, 701, 801) comprising: - an electrical energy source (10, 710, 810); - a hydrostatic kinematic chain, the hydrostatic kinematic chain comprising an electric motor (9, 709, 809) supplied with electrical energy by the electrical energy source (10, 710, 810), a hydrostatic pump (11, 711, 811) driven by the electric motor, at least two drive units (12F, 12R, 712F, 712R, 812F, 812R), each drive unit comprising at least two drive wheels (8F, 8R, 708F, 708R, 808F, 808R), and at least one hydrostatic motor (13F, 13R, 713F, 713R, 813F, 813R) enabling a rotation of the at least two drive wheels, a drive displacement of the drive unit being equal to the displacement (D m, D m1, D m2) of the at least one hydrostatic motor supplied with hydraulic fluid by said hydrostatic pump, a total motor displacement (D Σ) being equal to a sum of the drive displacements of the two drive units, characterised in that at least one of the two drive units being configured as a variable drive unit having a variable drive displacement and in that a switching device (20, 720, 820) configured to switch the variable drive displacements selectively between at least one slow movement in which the total motor displacement is equal to a first value (D Σ,max), and a rapid movement of the working vehicle in which the total motor displacement is equal to a second value (D Σ,min), the first value (D Σ,max) being strictly greater than the second value (D Σ,min); and in that - a control unit (25, 725, 825) configured to control a rotation speed of the electric motor, such that, in response to a switching of the drive displacement to pass from the rapid movement to the slow movement, increasing the rotation speed of said electric motor, such that the hydrostatic pump provides a flow rate of hydraulic fluid required to respond to an increase of the total motor displacement, and in response to the switching of the drive displacement to pass from the slow movement to the rapid movement, reducing the rotation speed of said electric motor, such that the hydrostatic pump absorbs an excess flow rate of hydraulic fluid resulting from a decrease of the total motor displacement. - an electrical energy source (10, 710, 810); - a hydrostatic kinematic chain, the hydrostatic kinematic chain comprising an electric motor (9, 709, 809) supplied with electrical energy by the electrical energy source (10, 710, 810), a hydrostatic pump (11, 711, 811) driven by the electric motor, at least two drive units (12F, 12R, 712F, 712R, 812F, 812R), each drive unit comprising at least two drive wheels (8F, 8R, 708F, 708R, 808F, 808R), and at least one hydrostatic motor (13F, 13R, 713F, 713R, 813F, 813R) enabling a rotation of the at least two drive wheels, a drive displacement of the drive unit being equal to the displacement (D m, D m1, D m2) of the at least one hydrostatic motor supplied with hydraulic fluid by said hydrostatic pump, a total motor displacement (D Σ) being equal to a sum of the drive displacements of the two drive units, characterised in that at least one of the two drive units being configured as a variable drive unit having a variable drive displacement and in that a switching device (20, 720, 820) configured to switch the variable drive displacements selectively between at least one slow movement in which the total motor displacement is equal to a first value (D Σ,max), and a rapid movement of the working vehicle in which the total motor displacement is equal to a second value (D Σ,min), the first value (D Σ,max) being strictly greater than the second value (D Σ,min); and in that - a control unit (25, 725, 825) configured to control a rotation speed of the electric motor, such that, - a control unit (25, 725, 825) configured to control a rotation speed of the electric motor, such that, in response to a switching of the drive displacement to pass from the rapid movement to the slow movement, increasing the rotation speed of said electric motor, such that the hydrostatic pump provides a flow rate of hydraulic fluid required to respond to an increase of the total motor displacement, and in response to the switching of the drive displacement to pass from the slow movement to the rapid movement, reducing the rotation speed of said electric motor, such that the hydrostatic pump absorbs an excess flow rate of hydraulic fluid resulting from a decrease of the total motor displacement.