In modern rail construction, efficiency in the tightest of spaces is crucial. The outer curve turnout (ABW) is an indispensable element of the railroad system, as it enables turnout connections in curves without interrupting the flow of traffic. While conventional turnouts often come up against geometric limits, the special design of the ABW allows a smooth change from one track to another.
As an experienced partner in track and rail construction, Bharat Forge CDP Railsystems supports operators in Germany and worldwide in maximizing the availability of their railroad infrastructure.
Geometry and technology: How an outer curve switch works
In contrast to the inner curve turnout, where both track curves run in the same direction, the outer curve turnout describes an opposite curvature. This means that the branching track runs outwards against the curvature of the main track. Technically speaking, the curve centers of the main and branch tracks are on different sides.
This design offers decisive advantages for the route:
- Larger radius: Due to the curvature, the branch often describes a larger radius than comparable switch types.
- Higher speed: Thanks to the optimized radius, the speed in the branching line can often be set higher.
- Precise track guidance: A typical frog angle of around 11 degrees in combination with an exact groove width ensures that even different wheel sets pass the turnout smoothly.
The exact coordination of rail profiles and the track layout is essential for a safe ride. CDP Railsystems relies on the highest manufacturing standards to minimize forced guidance or unnecessary speed restrictions due to the curve position.
Components for safety and durability
A high-performance outer curve turnout is only as good as its individual parts. In order to absorb the high mechanical loads in curves, CDP Railsystems only uses precision-manufactured components. Every component in the structure of the turnout must be perfectly matched to the track.
- Point devices & stock rails: The switch points guide the wheelset safely in the new direction. A high-quality switch roller device minimizes frictional resistance when switching, which reduces wear and optimizes operating costs.
- Frog: The frog is the point at which the rails cross. Here, the frog angle and an exact groove width are decisive for smooth running.
- Locking & control: A reliable point lock (such as the EVZ unit lock or clamp point lock) is essential for the mechanical locking of the end positions. In modern systems, control is often via precise servos or hydraulic systems.
- Stability: The sliding chair plate ensures clean guidance of the tongue, while robust ribbed plates and precisely fitting sleepers anchor the entire system stably in the ballast bed.
Areas of application and maintenance of the outer curve switch
The outer curve turnout shows its strengths above all where turnout connections have to be integrated into existing curves. As this design is often subject to increased lateral pressure due to the curved position, the quality of the rails is of central importance.
If wear and tear occurs, repairs to the switch must be carried out efficiently. Our catalog includes a wide range of components that are quickly available to keep downtimes in the rail network to a minimum.
Conclusion: Your partner for precise turnout technology
The outer curve turnout enables maximum flexibility in the design of stations and track networks. The quality of the components used is crucial for them to fully exploit their advantages. Bharat Forge CDP Railsystems is your competent partner for the improvement of railroad infrastructure with technologically leading components.
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