ALe 426/506 TAF (acronym of Treno ad Alta Frequentazione) is an Italian Electric Multiple Unit (EMU) used mainly on commuter regional trains.

Some slightly modified version of the EMU have been purchased by Moroccan Railways in 2006.

[1] Each train is formed by fixed sections of four bi-level pieces: two motorized units (ALe 426/506) and two coaches between them (Le 736).

Two sections can be coupled together, but by now it is not possible on Trenitalia units (on FNM ones is common practice).

ALe 426/506 employs asynchronous three-phase traction motors feed by the 3000 V DC catenary.