For decades, station operators improvised solutions using rubber mats, manual bridge plates, or simply warning signs. However, the lack of a unified safety standard led to inconsistent performance, varying reliability, and legal liability issues. Enter .

: Systems to verify that a train is correctly positioned relative to the platform doors before they can be opened. Emergency and Driver Access

EN 17168 defines two critical dimensions:

The primary objective of EN 17168 is to define the minimum safety, functional, and performance requirements for —mechanical or electro-mechanical devices designed to bridge the horizontal and/or vertical gap between a stationary railway vehicle and the platform coping edge.

refers to a European standard for railway platform barrier systems

Here is a concise piece explaining its purpose and application: