Standards
of interlocking
Depending on the volume of traffic, devices
provided to confirm the speed factor there are three standards of interlocking.
The equipment of signal, mode of locking and operation of points, signals, etc
vary in these different standards.
|
Sl
No.
|
Particulars
|
STD I(R)
|
STD II(R)
|
STD III(R)
|
STD IV(R)
|
|
1
|
Isolation
|
Optional,
It may be provided for simultaneous reception.
|
Essential
|
Essential
|
Essential
|
|
2
|
Type
of interlocking
|
Partial or full
Direct
or indirect
|
Partial or full
Direct
or indirect
|
Full
Direct only
|
Full
Direct only
|
|
3
|
Point Indicator
|
Compulsory
|
Not Compulsory
|
Not
required
|
Not required
|
|
4
|
Mode of
locking points
|
Hand
bolt plunger key
|
Plunger
type
|
Plunger
type
|
|
|
|
Signals –
MAS
|
Distant,
Home & starter is optional
|
Distant,
Home, Starter
Advanced
starter is optional.
|
Distant, Inner Distant, Home,
Starter
and Advanced starter.
|
Distant,
Inner Distant, Home, Starter and Advanced starter.
|
|
6
|
Speed over facing points M/L
|
50 kmph
|
110 kmph
|
140 kmph
|
160 kmph
|
