MACLS Signaling System Overview

Multiple Aspect Colour Light Signalling system

Train signals must be illuminated by electricity; no phantom indications allowed

Colour light multi-unit type

Position Light type

Signals usually on the left/above the track, or right with direction arrows, placed to maximize visibility and avoid confusion of signal aspects

Signalling should be consistent across a section and at stations, matching the allowed speed

Minimum distance between signal blocks (180 meters for multiple-aspect signaling).

Turned away and marked with crossed bars (at least 1 meter long, 10 cm wide) and not illuminated

The minimum distance required between a train and a signal or other point on the track for safety of operations.

The minimum distance between signals to prevent collisions if a train is delayed or another train enters the section.

The signal that a train must stop before entering mainline track section.

Confirmation from the next section of the track that it's safe for a train to proceed further.

Signal that allows a movement on a designated track.

Signal system with two distinct signal aspects (e.g., red for stop, green for proceed).

Signal system with multiple signal aspects, offering more detail for train movements.

Signal system that combines elements of two-aspect and multiple aspects.

A signal that indicates conditions further ahead on the track.

A signal that requires a train to immediately stop.

The minimum distance a signal should be seen from a train for safe operation

A signal located closer to the main signal, providing an additional warning

Area where a single distant signal governs all aspects of train movement

Area where multiple distant signals provide different indicators for various sections of the track.

Signals that use different colours (e.g., red, yellow, green) to indicate different aspects.

Distant signals are placed behind the first stop signal, at a minimum distance of 1 kilometer in single distant territory, and 2 kilometers behind the first stop signal in double distant territories, considering emergency braking distances.

A track section requiring two distant signals due to longer emergency braking distances.

Located behind any connecting points, at least 180 meters behind the furthest obstructive points.

The order of signal aspects (Stop, Caution, Proceed) needs to ensure safe train operation. A signal cannot display a less restrictive aspect than the signal behind it.

A signal placed in the rear of points to guide trains to the correct route.

A signal provided at converging lines to protect adjacent lines.

A signal placed behind points, which it protects, and clear of foul marks.

Placed outside any connections on the line it applies to, typically a considerable distance from points.

Located a set distance behind gates to protect them from trains.

A divisional signal placed in the middle of a block section on double/single lines.

Signals spaced apart by one kilometer (typically), subject to other requirements, for automated operation.

The spacing between a signal and next signal, which must be large enough for safe train operations.

Section of track with one distant signal.

Distance a train takes to stop and a crucial factor in signal placement.

A signal that can display multiple aspects (stop, caution, proceed) and is crucial in signalling for safe train operation

When signals must combine due to location, only one stop signal is permitted. This combined signal can display stop, caution, attention, and proceed aspects, controlled by special instructions.

Lines separating require a route indicator. Different speed limits need different route indicator types.

Direction type Route Indicator used for up to 3 diversions on either side of the main line

Any approved route indicator may be used

When lines converge, signals are positioned on separate posts.

Taken 'OFF,' it signals a train to cautiously proceed ahead, even if the Stop Signal remains 'ON'.

A miniature yellow light displays for preparation / caution when the train has to move.

No light displays; signal is not active for movement.

Placed below a Stop Signal to control train approach.

Controls shunt movements, ensuring track and crossing clarity

Position Light type, white lights.

Two horizontal lights in the 'ON' position

Two lights at 45 degree angle above horizontal in the 'OFF' position

Signals cannot function simultaneously.

5 rail lengths for reception; 60 sec time delay required

Train signals must be illuminated by electricity; no phantom indications are allowed.

Colour light multi-unit type signals are used for main lines.

Position light type signals are used for shunting operations.

Signals usually on the left/top, or right with an arrow to the line, positioned to maximize visibility and avoid confusion.

Signalling should be consistent within a section and at stations, matching speed limits.

Minimum distance between signal blocks (180 meters for multiple-aspect signaling).

Turned away and marked with crossed bars (at least 1 meter long, 10 cm wide), and not illuminated.

The order of signal aspects (Stop, Caution, Proceed) - signals cannot display a less restrictive aspect than the signal behind it.

The minimum distance required between a train and a signal or another point on the track, essential for safe train operations.

Minimum distance between signals to prevent collisions if a train is delayed or another train enters the track section.

The signal a train must stop before entering a mainline track section.

Confirmation from the next track section that it's safe for a train to proceed.

A signal that allows movement on a designated track.

A signalling system using two signal aspects: red (stop) and green (proceed).

A signalling system with multiple (more than two) signal aspects.

A signal indicating conditions further ahead on the track.

A signal that requires an immediate train stop.

Minimum distance a signal should be seen from a train for safe operation.

A signal located closer to the main signal, providing additional warning.

An area where one distant signal controls all train movements.

An area where multiple distant signals provide extra control over different sections of the track.

Signals that use different colours (e.g., red, yellow, green) for various aspects.

A signal that displays more than one aspect, e.g. red (stop), yellow (caution) and green (proceed).

Distant signals are placed behind the first stop signal, at a minimum distance of 1 kilometer in single distant territory and 2 kilometers in double distant territories, considering emergency braking distances.

A track section requiring two distant signals due to longer emergency braking distances.

Located behind any connecting points, at least 180 meters behind the furthest obstructive points.

The order of signal aspects (Stop, Caution, Proceed) needs to ensure safe train operation. A signal cannot display a less restrictive aspect than the signal behind it.

A signal placed in the rear of points to guide trains to the correct route.

A signal provided at converging lines to protect adjacent lines.

A signal placed behind points, which it protects, and clear of foul marks.

Placed outside any connections on the line it applies to, typically a considerable distance from points.

Located a set distance behind gates to protect them from trains.

Section of track with one distant signal.

Distance a train takes to stop and a crucial factor in signal placement.

A signal that can display multiple aspects (stop, caution, proceed) and is crucial in signalling for safe train operation

A divisional signal placed in the middle of a block section on double/single lines.

Signals spaced apart by one kilometer (typically), subject to other requirements, for automated operation.

The spacing between a signal and next signal, which must be large enough for safe train operations.

When signals need to combine due to location, only one stop signal is allowed. This combined signal can display stop, caution, attention, and proceed aspects, controlled by special instructions.

Lines that separate need a route indicator to guide the trains. Different speeds require different route indicator types.

Direction type Route Indicator is used for up to 3 diversions on either side of the main line.

Any approved route indicator can be used.

When lines converge, signals must be positioned on separate posts.

When switched to 'OFF', it alerts the train driver to proceed with caution, even if the stop signal is still on.

A yellow light appears to prepare the driver for cautionary movement.

No light displays.

Position it below the Stop Signal that manages train approach.

Controls shunting movements, guaranteeing track and crossing safety.

Position Light type, using white lights for indications.

Two horizontal white lights.

Two white lights at a 45-degree angle.