The primary suspension in a railway bogie is the first stage of isolation between the wheelset and the bogie frame. Its main functions are to guide the wheelset laterally, support the bogie frame weight, and provide controlled compliance in the vertical and lateral directions to absorb track irregularities before they reach the passengers.
Our primary suspension product range covers rubber springs, chevron elements, axle box springs, and suspension pads engineered for metro, light rail, commuter rail, and mainline passenger applications. All products are manufactured to precise dimensional and mechanical tolerances derived from vehicle dynamic analysis.
Key design parameters for primary suspension elements include static deflection under nominal axle load, vertical and lateral stiffness, natural frequency of the primary suspension mode, and long-term fatigue life under service loading spectra. We work with railway operators and rolling stock builders to confirm these parameters for each application.
All primary suspension components can be supplied with EN 45545-2 fire safety certification. This standard is referenced in US rail procurement specifications as an equivalent international fire safety benchmark. Test reports are available from accredited third-party laboratories.
