pályasík

Pályasík is a Hungarian term that translates to "track plane" or "level track." It refers to a concept in railway engineering and design, particularly concerning the alignment and geometry of railway lines. The term emphasizes the importance of maintaining a consistent and smooth vertical profile of a railway track, especially in relation to horizontal curves and gradients.

A well-designed pályasík aims to minimize changes in gradient and ensure a gentle transition between different slopes. This is crucial for efficient train operation, reducing wear and tear on rolling stock and infrastructure, and ensuring passenger comfort. When a railway line deviates significantly from an ideal pályasík, it can lead to increased tractive effort required by trains, higher fuel consumption, and potential safety concerns, especially on steep or abruptly changing gradients.

The concept is particularly relevant when considering the superelevation or cant applied to tracks on curves. The interaction between the cant, gradient, and the resulting forces on the train needs careful consideration to maintain stability and prevent derailment. Engineers use the principles of pályasík to optimize the design of new lines and the rehabilitation of existing ones, ensuring that the vertical alignment is as harmonious as possible with the horizontal alignment and operational requirements. Essentially, it's about creating a seamless and predictable path for trains to follow.