ratapölkky

Ratapölkky is a Finnish term that translates to "rail sleeper" or "tie" in English. It refers to the structural element used in railway tracks that supports the rails and transfers loads to the ballast. Historically, ratapölkky were commonly made of wood, typically treated timber to resist decay and insect damage. These wooden sleepers played a crucial role in maintaining the gauge of the track, ensuring the rails remained a fixed distance apart. Wooden ratapölkky were widely used in Finland's railway network for many decades.

Over time, other materials have been introduced and also referred to as ratapölkky. Concrete sleepers, often made of pre-stressed concrete, have become increasingly common due to their durability, longevity, and resistance to fire and rot. Steel sleepers also exist, though they are less prevalent than concrete or wood. The choice of ratapölkky material can depend on factors such as traffic volume, climate conditions, and economic considerations. Regardless of the material, the primary function remains the same: to provide a stable and secure foundation for the railway track.