Resumen
The paper aims at shedding a light on how the "capture" mechanisms defined by the public choice theory operates in the transport sector. The paper presents in its first part a definition of the concept of "capture" (prevailing of private/concentrated interests on public/dispersed ones), of public objectives and private or egoistic interests for politicians, bureaucrats, regulated companies and contractors. Then the relationships between subjects and actors are described in depth alongside with capture instruments and the role of "hidden agendas". Some relevant examples in the transport sector are given for illustration and remedies in order to pursue the public interest are analyzed.