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The Märklin 87991 is a second-class control coach for DB AG S-Bahn consists, reproduced in Z scale with running number Bxf 796.3 and placed in Epoch V. As a Steuerwagen, this coach occupies the end opposite the locomotive in a push-pull formation, allowing the train to be driven from the far end without turning the locomotive. The integrated LED lighting maintenance-free according to factory specification activates a three-light white headlight signal when the locomotive pushes from the other end, and switches to two red tail lights when the train runs in the opposite direction.
A control coach that gives the consist its logic
In Z scale, where every millimetre counts, the Steuerwagen is the piece that turns a set of coaches into a train with real operational logic. Placed at the free end of the formation, this Bxf 796.3 closes the consist visually and activates the correct light signal according to the direction of travel something that, on a well-planned layout, adds a layer of believability that conventional coaches simply cannot match. The system is two-rail DC, compatible with standard Z scale electronics.
Confirmed technical data
The length over buffers is 115 mm, a measurement that in Z scale represents a full-size coach of considerable length. The operator is DB AG in Epoch V, placing the model in the period of the unified Deutsche Bahn after 1994. The LED lighting is of the Stirnbeleuchtung type with Kopfleuchten: a three-light white headlight signal in push mode, and red tail lights in conventional traction mode. The coach has no motor or sound, as its role within the consist is that of a hauled coach with a driving cab.
Layout integration and consist building
On a Z scale layout with an urban or suburban track plan, this control coach provides the logical finishing touch to an S-Bahn formation: the train has a recognisable front and rear, and the direction-dependent lighting reinforces the sense of real operation. For those building DB AG Epoch V consists, the Bxf 796.3 is the natural complement to any compatible locomotive or power unit. It is worth noting that Märklin lists this item as discontinued from the factory, so availability on the secondary market and in specialist shops may be limited.