Boards and Indicators
Point Indicator
Point set for main line.
Point set for turnout/loop line
Ø This is a mechanical
appliance fitted along with points and works in conjunction with points.
Ø When the points are
set for Main Line it will show White target
during Day and a White light during Night in both directions.
Ø When the points are
set for turnout, it will show knife edge of the disc during Day and a Green
light during Night in both the directions.
Ø This will be
provided at stations where the speed over points is up to 50 kmph in Two Aspect
and up to 75 kmph in Multiple Aspect signals with single arm home.
Ø During Reception and
Dispatch and shunting operation this must be observed by the LPs.
Trap Indicator
Trap open Trap closed
§ This is a mechanical
appliance works in conjunction with trap points.
§ When the trap is
open, this will show Red target during Day and Red light during Night in both
the direction.
§ When the trap is closed,
this will show knife edge of disc during Day and a Green light during Night in
both directions.
§ During shunting
operation this must be observed by LPs.
Shunting permitted
Indicator
Shunting permitted
Shunting not permitted
Ø
This
is not a stop signal, but works in conjunction with a stop signal.
Ø
An
yellow cross light both during day and night in color light areas will be the
“Shunting permitted position”.
Ø
No
light during Day/Night is shunting “not permitted” indication.
Ø
It
authorizes movement in both the direction along with Hand signals.
Ø
The
stop signal cannot be taken off when the shunting permitted indicator is
showing “Shunting permitted position”.
Ø
When
this indicator fails form T.370 + PHS is the authority.
Route Indicator
Route indicators work in conjunction
with stop signals and are of three types – Directional type, Non-Directional
type and LED Matrix with Directional type.
Directional
·
This
type shall not show any route when the route is set for the straight line.
·
It
shall indicate a route by a row of white lights either to the right or left
depending upon the direction of the route set for turnout.
·
The
signal is deemed to have failed if only the route indication is shown without
OFF aspect in the stop signal.
Stenciltype
Multiple lamp type
It may be –
Ø A stencil type where
the route is shown by an illuminated stenciled letter or number, or
Ø A multi-lamp type
where route is shown by the burning of multiple miniature lamps in the form of
a letter or number, or
Ø A projector type
where a number or letter is projected on an illuminated plate in a box.
Ø These indicators
show for all the lines including main line.
Note: Signals working in
conjunction with Non-directional type Route indicators shall be deemed to have
failed if the Route Indicators show no route or incorrect route when the signal
is “OFF”.
LED
Matrix with Directional Type route Indicator
Ø It is a combination
of both directional and non-directional type. This type of Route Indicator is
provided at stations where there are more than three lines on one or both sides
of the main line in multiple aspect color light area.
Ø This shows the
direction along with the actual line number in the Matrix. When the route is
set for the main line it shows no direction or line No. in the Matrix. This is
to be treated as defective if incorrect route or direction is shown.
Ø Both directional
type and non-directional type should show the
route,If any one is not showing route it
is treated as defective.
