The Austro-Daimler "C-Zug", or "generator car", designed by Dr. Ferdinand Porshe, was one of those inventions ahead of its time. Introduced as an all purpose locomotive for military fort railways, it soon evolved into a road vehicle for carrying extra heavy loads.It used a revolutionary method of propulsion - a gasoline engine in the main body of the machine is connected to a generator, which in turn provides electrical power to motors attached to each of the rear wheels. By a system of interconnecting cables, electricity can then be transferred to the specially built trailers which consist of two identical four-wheel units placed end to end, also each with its own motor.
In the end this resulted into a powerful, flexible system, able to transport considerable loads over long distances.
Another feature was the ability to travel on a variety of surfaces, by replacing wheel rims. The "standard" wheels are designed for rail travel (either under its own power or towed by a conventional locomotive) and special rims for road -with solid rubber tyres- or rough unprepared surfaces -metallic wide track wheels reminiscent of those used in the M17 tractor- can be fitted.
The trailer units are also entirely interchangeable with one another, for added flexibility.