In addition to this official order, Alstom also develops a locomotive solely for the 20 kV / 50 Hz single-phase alternating current system, which the firm is building at its own expense.
Although it does not correspond to the initial specifications, the first tests are promising and the French National Railway Company - SNCF agrees to acquire the locomotive.
It is delivered to Chambéry depot on June 28th, 1951, and it is registered as BB 8051.