What slope is typically given to the rail seat?

The slope given to the rail seat is commonly specified as 1 in 20. This slope is designed to facilitate proper drainage from the track, allowing water to flow away from the rail and preventing accumulation that could lead to rusting and degradation of the track infrastructure. A 1 in 20 slope strikes a balance between effective drainage and the structural stability required to support the dynamic loads imposed by trains.

Other slopes, such as 1 in 15, 1 in 25, and 1 in 30, are not standard for rail seat applications. A steeper slope may result in too rapid drainage, which could destabilize the ballast and track support, while a gentler slope may not drain effectively, leading to potential water-related problems. Thus, the 1 in 20 slope is widely accepted as an optimal standard that caters to both drainage needs and stability requirements in rail construction.