1) Introduction – Speed Upgrade as a Network-Wide Challenge

Across many mature railway networks, increasing line speed has become a practical alternative to building entirely new lines. Governments and operators aim to improve capacity and reduce travel time by upgrading existing infrastructure and rolling stock. However, higher operating speeds place new demands on running gear, particularly on bogie stability, vibration control, and compatibility with existing track conditions.

2) Application Scenario – Existing Line Speed Upgrade

This application focuses on railway bogies used in line speed upgrade projects, where rolling stock must operate at higher speeds on legacy track infrastructure. These projects often involve mixed track geometry, aging rails, and constraints on axle load and suspension travel.

Previously installed bogies were designed for lower speeds and showed limitations such as increased vibration, reduced running stability, and accelerated wear when operating beyond their original design range. Operators required a solution that could support higher speeds without extensive vehicle redesign.

3) The Bogie Solution – Stability-Oriented Design Adaptation

Kingrail supports speed upgrade programs with railway bogie solutions optimized for improved dynamic performance and adaptability. Rather than focusing solely on maximum speed, the bogie design emphasizes stable running behavior across a broader operating range.

Key solution aspects include:

• Optimized suspension parameters to improve vibration control at higher speeds

• Structural design adapted to balance stiffness and flexibility on existing track

• Compatibility with standard wheelsets and braking systems

These design considerations allow the railway bogie to support higher operational speeds while remaining suitable for legacy infrastructure. By aligning bogie performance with real track conditions, the solution helps operators avoid excessive infrastructure modification.

4) Results and Operational Impact

In many speed upgrade projects, adapted railway bogies contribute to smoother vehicle behavior and improved ride stability. Reduced vibration levels help lower secondary wear on wheelsets and track components, supporting more predictable maintenance planning.

From an operational standpoint, the ability to increase line speed without full fleet replacement delivers clear economic value. As a technical partner, Kingrail works with operators to evaluate operating envelopes and refine bogie configurations based on route characteristics and upgrade objectives.

5) Summary

This railway bogie solution is well suited for operators pursuing line speed upgrades on existing networks. It delivers particular value where infrastructure constraints limit more radical changes. The next step is to assess current bogie performance and engage with Kingrail to define an adaptable bogie solution aligned with upgrade targets.