2-piece extension car set to expand the high-speed train RABe 501 "Giruno" into an 11-car unit. Factory-installed interior lighting with maintenance-free warm white LEDs. The interior lighting is powered through the continuous electrical connection of the entire train and is only functional and digitally switchable in conjunction with the base set. The pantograph on one of the middle cars is also only operable in conjunction with the base set via the decoder as a separate digital function for raising and lowering. Both middle cars are firmly coupled together. Guided by a Jacob's bogie. Scaled replica. Minimum radius of 360 mm. Length of the car pair is 40.2 cm.

The base set 39810 can be expanded to a prototype-compliant 11-car unit with the extension car sets 43461, 43462, and 43463.