In conventional jointed track, how many bolts must be used for each rail at a joint in classes 2-5?

In conventional jointed track, it is required that at least two bolts be used for each rail at a joint in classes 2-5. This requirement ensures the necessary stability and alignment of the rails at the joints, which is critical for maintaining a safe and smooth running surface for trains. Two bolts provide sufficient load distribution and secure the joint against movement caused by dynamic forces from passing trains, which can lead to misalignment or excessive wear if not adequately secured. While using at least one bolt might provide some level of support, it would not be sufficient for the demands placed on the track, especially in higher traffic classes. The use of three bolts is typically more than what is required for these classes, and having no specific requirement would undermine safety standards. Therefore, the correct number of bolts ensures structural integrity and enhances safety in rail operations.