Interlocking
Interlocking means
an arrangement of signals, points 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.
Non-interlocked
Ø
In
the beginning there was no interlocking between points and signals.
Ø
Facing
points can be altered in the face of approaching train.
Ø
Human
element only played an important role in ensuring safety.
Ø
The
speed of trains is restricted to 15 kmph over facing points.
Direct
interlocking
Ø In this type the
points and signals are grouped together and operated from one and the same
place from a cabin or panel.
Fully
interlocking
Ø In this taking off
reception signal detects setting of points at the trailing end also.
Ø Reception signals
can be taken of only after setting and locking all the facing points for the
line of reception up to signal overlap.
Essentials
of interlocking
Ø It shall not be
possible to take off signals unless the concerned points are correctly set and
facing points locked.
Ø When a signal is
cleared it shall not be possible to alter points or open LC gates.
Ø It shall not be
possible to take off conflicting signals at the same time leading to
conflicting movements.
Ø Where possible
points are interlocked with each other to avoid conflicting movements.
