Prototype: Second-class passenger car of the German Federal Railways (DB) for so-called light express trains (LS). Design type Bylb 421, commonly known as "middle-entry car." Features small end lights located at the top and single-pane windows at the entrances at the end of the car. Color scheme in ocean blue/ivory. Operational condition around 1980. Model: Factory-installed LED interior lighting and powered couplings. The interior lighting only works in conjunction with the middle-entry control car and can be turned on and off digitally via a decoder in the control car. Red transparent tail light inserts at the ends of the car. Type-specific designed underframe. Minden-Deutz heavy bogies with double-block brakes and generator D 62s. Minimum curve radius of 360 mm. For display in a showcase, toilet drain pipes and push-pull control lines are included as separately attachable parts. Length over buffers 28.2 cm.