POS is an abbreviation of Paris-Ostfrankreich-Süddeutschland (English: Paris, Eastern France, Southern Germany), the route of the LGV Est.

The tri-current function was necessary for the LGV Est, which ends at the German border, where the electrification switches to the 15 kV  16.7 Hz AC system.

The project allowed SNCF to receive the tri-current power cars needed ahead of the opening of the LGV Est, without slowing the production of the Duplex trainsets.

On 3 April 2007 a train using both power cars of the TGV POS trainset number 4402 set a new world speed record for travel on conventional rails.

[5] The maximum speed was achieved near kilometer post 193 on the LGV Est between Meuse and the Champagne-Ardenne TGV stations.