4.1 The triangular guideway
The RUFs "ride" on top of a triangular (or rhombic) guideway. They are carried by four-rail wheels with smooth surfaces in order to reduce rolling resistance and noise. Half of the wheel noise is actually absorbed in the narrow gap between the RUF and the guideway, so very little noise is emitted to the surroundings.
The center of gravity is situated below the top of the guideway, so the stability is extremely high.
A special rail brake is placed behind the center of gravity. In case of an emergency braking, the RUF is able to stop very fast because the braking power is unlimited. If more power is needed, the rail brake will put more pressure on the sides of the rail. In a traditional train system braking power is limited, because the friction is created by gravity.
The drive wheels are placed in front of the center of gravity which is ideal. Traction can be increased by putting more pressure on the wheels against the rail. This means that the RUF can climb up steep slopes.
The guideway is very compact and slender because it is running through the middle of the vehicle. This principle ensures a low cost and a moderate visual impact.