A train coupler comprising: - mechanical means for mechanically coupling with another train coupler; - a primary pneumatic circuit comprising a main air distribution line adapted to be connected with and supply air (F A) into a pneumatic circuit of said another train coupler, via a first inlet/outlet, and further comprising at least: - a movable electrical head connected to first actuating means which are configured to be pneumatically actuated and drive the electrical head to move between a non-operative retracted position and an extended position where it is adapted to be electrically coupled with an electrical head of said another train coupler; - a secondary pneumatic circuit which is pneumatically connected to said primary circuit and is arranged to convey flows of air (F D) derived from said main air distribution line towards said first actuating means, characterized in that the flows of air of the secondary pneumatic circuit are conveyed towards a second inlet/outlet, the secondary pneumatic circuit being suitable to be pneumatically connected with the pneumatic circuit of said another train coupler via the second inlet/outlet, wherein said secondary pneumatic circuit is configured to be switched, based on an electrical activation signal (S A) generated by a train control unit, between a first operative configuration where the derived flows of air (F D) towards said first actuating means and said second inlet/outlet are blocked, and a second operative configuration where said derived flows of air (F D) are permitted pneumatically actuating at least said first actuating means to drive the electrical head to move to the extended position for electrically coupling with the electrical head of said another train coupler. - mechanical means for mechanically coupling with another train coupler; - a primary pneumatic circuit comprising a main air distribution line adapted to be connected with and supply air (F A) into a pneumatic circuit of said another train coupler, via a first inlet/outlet, and further comprising at least: - a movable electrical head connected to first actuating means which are configured to be pneumatically actuated and drive the electrical head to move between a non-operative retracted position and an extended position where it is adapted to be electrically coupled with an electrical head of said another train coupler; - a secondary pneumatic circuit which is pneumatically connected to said primary circuit and is arranged to convey flows of air (F D) derived from said main air distribution line towards said first actuating means, characterized in that the flows of air of the secondary pneumatic circuit are conveyed towards a second inlet/outlet, the secondary pneumatic circuit being suitable to be pneumatically connected with the pneumatic circuit of said another train coupler via the second inlet/outlet, wherein said secondary pneumatic circuit is configured to be switched, based on an electrical activation signal (S A) generated by a train control unit, between a first operative configuration where the derived flows of air (F D) towards said first actuating means and said second inlet/outlet are blocked, and a second operative configuration where said derived flows of air (F D) are permitted pneumatically actuating at least said first actuating means to drive the electrical head to move to the extended position for electrically coupling with the electrical head of said another train coupler. - a movable electrical head connected to first actuating means which are configured to be pneumatically actuated and drive the electrical head to move between a non-operative retracted position and an extended position where it is adapted to be electrically coupled with an electrical head of said another train coupler; - a secondary pneumatic circuit which is pneumatically connected to said primary circuit and is arranged to convey flows of air (F D) derived from said main air distribution line towards said first actuating means,