How many tie plates are required under running rails on wood ties in classes 3 - 5 track?

In classes 3 - 5 track, the requirement of having at least 8 out of 10 consecutive ties equipped with tie plates is established to ensure adequate support and stability for the running rails. Tie plates serve several crucial functions, including distributing the weight of the rail and the forces exerted by trains, helping to prevent tie rotation, and preserving the alignment of the track.

While some classes of track might have more stringent requirements or even relaxation in other contexts, the guideline for classes 3 - 5 specifically demands that a substantial majority of ties – in this case, eight out of ten – should include tie plates. This reflects a balance between structural integrity and practical considerations, ensuring enough rail support without imposing an excessive burden on maintenance or installation. The correct choice emphasizes the importance of maintaining track safety and performance within these specific class parameters.