Why are interlocking rules put in place?

Interlocking rules are essential for preventing accidents by ensuring coordinated signal operations. These rules dictate how signals and switches in a rail yard or along a track are controlled to promote safe train movements. When multiple trains operate simultaneously, the possibility of collisions or unintended movements increases. Interlocking mechanisms, which are made up of both mechanical and electronic systems, ensure that switches are aligned correctly before allowing a train to proceed, thus eliminating conflicting movements within the same track segment.

By enforcing coordinated signal operation, interlocking rules create a system of checks and balances that enhance safety across the rail network. For example, if one train is heading toward a certain section of track, the interlocking system will prevent another train from entering that section until it's safely clear, greatly reducing the risk of head-on collisions or derailments.

While other options may touch on various aspects of railway management or operations, the primary function of interlocking rules is rooted in accident prevention through precise coordination of signals.