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The SERSA Group EDK 750 is one of those vehicles that completely changes the reading of a layout. It is neither traction nor conventional rolling stock: it is heavy railway machinery in HO scale, and Roco has reproduced it under reference 73039 with a level of functionality that goes far beyond decoration. The set includes the main 6-axle crane and its protection and support wagon, with a total length of 234 mm over buffers.
Independently controllable motor functions
The onboard digital decoder manages several micro-motors autonomously: the turret rotates 360° without end stops, the telescopic boom raises and lowers, the inner telescopic section extends or retracts at any angle, and the metal hook rises and falls, regulating the cable through the integrated pulley system. All with smooth start and stop logic that simulates the inertia of real machinery. The side stabilisers deploy manually to fix the crane on the layout before operation. A freewheeling function also allows the crane to run integrated into any consist without straining the motor.
LED lighting and sound module
Lighting management is independent: directional signalling, interior and exterior cab illumination, and LED working floodlights mounted on the telescopic boom. The sound module reproduces the auxiliary diesel engine, acoustic warning signals, compressors and the squeal of the rotation gears. The set is compatible with the Roco Z21 ecosystem, including app control with a dedicated graphical interface for this crane and mapping for wireless gamepad-style controllers. The system is DC as standard; operation on three-rail AC systems requires axle replacement as specified by the manufacturer.
Layout presence and role within the consist
In a track maintenance or infrastructure works scene, this set adds a dimension that conventional passenger or freight trains simply cannot provide: the feeling that the layout has a life of its own beyond train movements. With its 234 mm total length and minimum radius of 358 mm, it occupies space with purpose and fits layouts that accommodate that radius. The SERSA Group yellow and black livery, with registration 99 85 9219 100-6, places the model firmly in Era VI and integrates it coherently into contemporary railway infrastructure scenes.