Electric luggage railcar De 4/4 1669 of the Swiss Federal Railways.

■ For the first time, available with PluX22 Interface and LED lighting
■ Window in the luggage compartment with replicated grille bars

A total of 11 Fe 4/4 units were equipped with an electric brake in 1930/31 and again in 1938 for operation on the Seetalbahn and the steep Vallorbe–Le Pont line. As part of a decision to modernise this sub-series, the Yverdon workshop rebuilt unit De 4/4 1669 in 1965/66. At the time, it was intended to serve as a prototype, was allocated to the Lausanne depot, and was already due for a major overhaul. The rebuilt railcar featured several upgrades, including: a driver's cab adapted for seated operation, new pneumatic equipment, a compressed-air main switch, a new contactor bank, and a closed driver's cab. The only feature that retained its traditional appearance was the classic dark green livery with a light grey underframe.