Rheda RX Metro Track System
High Efficiency Resilience System
Unique Protection From Structure-Borne Noise
RHEDA RX is a ballastless track designed as a mass-spring system with resilient support over its entire tunnel invert contact surface. This solution provides effective isolation against vibrations resulting from all types of passing trains. The system forms an effective mechanical filter in the track substructure – well below the track superstructure – which ensures outstanding insertion loss (IL) performance far beyond what is generally achievable with superstructure-based elasticity.
The reason for this higher effectiveness is the greater mass above the resilient layer. Final design of the system is always project-specific. Implementation includes consideration of a great number of vibration-relevant parameters, including the use of a highly advanced multi-degree-of-freedom (MDOF) dynamic track model that provides for a realistic prediction of IL at all critical frequencies: i.e., the degree of vibration isolation expected. Subsequently, the optimal combination of slab thickness and type of elastic mat can be defined.
The illustration shows a tunnel cross-section with generic rolling stock and soil data as well as three RHEDA RX track forms at a depth of 40 m from the at-grade level and at +/- 30 m from the vertical track centre line.
Based on IL predictions obtained via the Pipe-in-Pipe Model from University of Cambridge, the colour scale denotes typical IL values as a function of the distance from the tunnel wall.
With the exception of the freely accessible rails and rail-fastening systems, no maintenance measures are required for RHEDA RX. This especially applies to the central component of the system: the full-contact stone-wool-based resilient mats installed between the concrete supporting layer and the tunnel invert. The resilient Rockdelta mats demonstrate an outstanding degree of effectiveness and ultra-long service life.
The resilient mats also allow the use of stiff – and therefore simpler – fastening systems from all leading manufacturers. This significantly reduces the loads placed on the fastenings and appreciably extends the service life cycle. Application of bi-block sleepers and proven top-down installation methods ensure extremely exact track geometry and thus help to ensure excellent riding comfort.