Rail transportation vehicles, such as high-speed trains, subways, and locomotives, have extremely stringent requirements for electrical connection reliability. Terminal blocks are widely used in onboard control systems, traction systems, door control, lighting, and passenger information systems. They must comply with strict fire, smoke, and toxicity (FST) standards like EN 45545. Their design withstands constant vibration and shock, ensuring absolute reliability during high-speed operation and acceleration/deceleration. High protection ratings (e.g., IP20) prevent the ingress of dust and moisture. Pluggable designs facilitate the quick replacement of faulty modules, minimizing maintenance downtime and ensuring punctuality and operational safety.