A cable transportation system configured to move transportation units along a designated or given track has a switch with a first movable guide having one degree of freedom, along an operating plane, between two designated or given positions; a second movable guide having one degree of freedom, along the operating plane, between two designated or given positions; and a third and a fourth movable guide connected rigidly to each other and having one degree of freedom, along the operating plane, between two designated or given positions; the first, second, third and fourth movable guide being configured so that the first and second movable guide each define a continuation of the third or fourth movable guide.