INTERLOCKING AND ISOLATION
INTERLOCKING has been defined in the General Rules as an arrangement of points , signal and other appliances operated from a panel or Lever frame so interconnected by mechanical locking or electrical locking or both that their operation must take place in proper sequence to ensure safety.
Necessity
- Eliminates the dependence on human element to achieve safety.
- Ensures that signal can be taken “OFF” only after the relevant facing points are correctly set and locked and trailing points are correctly set.
- Ensures that once the signal has been taken “OFF”, it should not be possible to change the position of the points or unlock them.
- Prevent conflicting signals. Increases speed over main line.
