The ideal retrofit solution to railway noise

Rigid Contract Tuned Mass Rail Damper

by Jabez Innovation Limited


No effect to signalling system
Outside rail grinding zone


Night time installation
One-bolt installation (30-100m / night)


Rigid contact interface
Suppress corrugation


No regular maintenance
Designed for 20 years life


Minimal obstruction to rail checking
Compact design with new technologies

Guranteed performance

Tunable for
individual rail

40 to 1600 Hz

Corrugation growth

-70 to -90 %

Rail noise

-4 to -12 dB(A)

Groundborne noise

-4 to -8 dB

Rail vibration

-8 to -18 dB

*Subjected to rail baseplate stiffness
** Subjected to P2 resonance contribution to GBN

Corrugation suppression – proven with data

Published paper with data


Rigid Contact

Unlike existing rail damper that uses rubber-to-metal contact, the patented rigid-contact interface provides 100% vibration transmission between rail and damper, which allows the strongest damping force counter-acting rail vibration. Depending on the choice of rubber material and loss factor, the damping force is amplified by a factor of 5 to 8, comparing to the original vibration force acting to the contact interface of the damper.

Vertical and lateral tuned mass damping

RCTMD adopts tuned mass damping mechanism to concentrate damping force to specific frequency. In contrast to other rail dampers, RCTMD also provides strong damping force to laterally which is a major factor to curve noise and corrugation formation. This allows RCTMD to be the only rail damper in the world that can also suppress corrugation growth rate by 90%.

Groundborne noise retrofit mitigations

Groundborne noise (GBN) reduction by rail damper is a “MISSION IMPOSSIBLE” due to small damper mass against huge mass in tunnel structure. However, for GBN caused by rail P2 resonance (unsprung mass resonance, in the range of 40 Hz to 100 Hz), Q-Damper is able to suppress the rail P2 resonance, and the associated GBN. The floor vibration data of the P2 resonance laboratory indicates GBN reduction in the range of 4 to 8dB(A). It is the only rail damper in the world strong enough to reduce GBN. Apart from traditional GBN mitigation by altering trackform design, RCTMD could be the alternative retrofit solution.

Full installation

Half installation

Double installation

You choose the density to fit your budget

Q Damper is modular design able to fit up to 3 units in the space between rail support. Half installation of RCTMD is already enough to reduce rail noise quieter than other sources (motor noise, wheel noise, etc.). Combined with our latest patented technology, -4 to 12 dB(A) noise reduction is guaranteed.

Please visit Project page on site performance data of Q Damper