To ensure optimal power supply for underground train systems Powerlines provides the tried and trusted conductor rail system. The conductor rail system is situated in close proximity to the rails. Although low voltage direct current is commonly used for underground systems, the extra-large rail cross-section used for the conductor rails guarantee reliable power provision. Depending upon the local conditions, the current can be drawn from three different places - below, above or from the side. Mechanical and electrical durability, resistance to corrosion and lack of attrition ensure the rails have a very long working life. Furthermore, consideration is shown to the environment by using reusable components that can later be subjected to single-material recycling.