Model: This is a 2-part add-on car set to expand the class RABe 501 "Giruno" high-speed powered rail car train to an 11-part unit. The cars have factory-installed interior lighting with maintenance-free warm white LEDs. The interior lighting is supplied with power from a continuous electrical connection throughout the entire train. It can only work and be controlled digitally in conjunction with the basic set. Both intermediate cars are coupled permanently to each other. There is a guide mechanism in the Jakobs trucks. The train is modelled true-to-scale. The minimum radius for operation is 360 mm / 14-3/16". Length of the pair of cars 40.2 cm / 15-13/16". The 39812 basic set can be expanded to a prototypical 11-part unit with the 43451, 43452, and 43453 add-on car sets. Find more Märklin explanation videos on our YouTube Channel. Spare parts for our articles can be found here in our spare parts search.