Factors affecting spacing/density
- Axle load and speed
- Type and section of rails
- Type and strength of sleepers
- Type of ballast and ballast cushion
- Nature of formation
Minimum Density
MKS: Minimum sleeper density= M+7 (BG)
FPS: Minimum sleeper density= N+3 (MG)
Spacing is not uniform
Spacing is less at joints. As joints are weak points and more impact of moving loads.