Automatic Block System on Double Line

A system that uses track circuits or axle counters to control signals and automatically place signals to 'on' when a train passes.

The line is divided into sections, each with a Stop signal at the beginning.

A track circuit or axle counter ensures the signal remains 'on' until the line is clear ahead and for a safe distance beyond the next Stop signal.

The Loco Pilot must bring the train to a stop in the rear of the signal, wait for a specific duration, and then proceed cautiously.

120 meters is the minimum safe distance beyond the next Stop signal on a double line track.

The Guard must display a Stop hand signal towards the rear unless otherwise instructed.

The Loco Pilot must sound the prescribed whistle code, exchange signals with the Guard, and then cautiously proceed.

Special instructions can override the minimum safe distance rule.

A signal displaying an 'ON' aspect means the track ahead is clear. However, the driver MUST maintain a cautious approach until the next stop signal or a physical obstacle is encountered.

When a train passes an 'ON' signal, the Guard must record the time the train passes the signal and the time it passes the next Stop signal. This information is used to ensure the train is operating safely and within speed restrictions.

All instances of passing an Automatic Stop Signal at 'ON' must be logged in a special register. This register is reviewed by operating officers to monitor adherence to speed limits and cautious driving practices.

After passing an 'ON' signal, the driver must proceed cautiously towards the next signal, even if the 'Off' aspect is visible. The reason: There might be an obstruction between the two signals.

To ensure safety, the driver must maintain a minimum distance of 150 meters or two clear overhead electrical masts between their train and any obstruction or the train ahead. This distance ensures there is enough time to react safely to any sudden events.

In dense fog conditions, after passing an 'ON' signal, the driver must reduce speed to 10 kmph. This is crucial for maintaining visibility and allowing the train to stop safely if needed.

After passing an 'ON' signal, the Guard must ensure the driver does not exceed the prescribed speed limit. This ensures that the train operates within safe parameters.

Electric Multiple Units (EMUs) follow a shorter minimum distance requirement of 75 meters or one overhead electrical mast when approaching obstructions or other trains.

When Automatic signalling fails, trains operate between stations under established instructions.

Trains must run in the designated direction on an Automatic Block System, moving against traffic is forbidden.

If an emergency requires trains to go against the usual traffic flow, special instructions ensure the track ahead is safe.

When a Semi-Automatic Stop signal operates as a manual stop signal and fails, it can only be passed under specific rules.

When a Loco Pilot is authorized to pass a Semi-Automatic Stop signal, they must follow the precautions for an Automatic Stop signal.

In Automatic Block territory, on a single line, the minimum distance between a Home signal and the next Automatic Stop signal is 180 meters. This space ensures safety by providing enough clearance for trains to stop if needed.

The minimum equipment required at a station in Automatic Block territory on a single line includes a home signal and a starter signal. These signals control train movements.

In Automatic Block territory on a single line, the last signal before a train leaves a station is the last Stop signal. This signal must be taken off only when the track is clear up to the next Automatic Stop signal or a Manual Stop signal at an adequate distance.

The adequate distance between signals in Automatic Block territory is 120 meters for a home signal and 180 meters for the last Stop signal. This distance, however, can be modified under special instructions.

When an Automatic Stop signal is at 'on', the Loco Pilot brings the train to a stop behind it and waits for a specific duration. This pause allows for necessary safety checks and communication.

In Automatic Block territory, a physical barrier like a sand hump or derailing switch can replace the required safe distance. These barriers prevent trains from accidentally proceeding on a blocked track.

The Loco Pilot must sound a whistle signal when passing an 'on' Automatic Stop signal. This notification is used for communication and safety purposes.

The Guard's duty when encountering an 'on' Automatic Stop signal includes displaying a stop signal towards the rear. This ensures safety and warns any following train that the track ahead is blocked.

When an Automatic Stop signal is 'on', the Loco Pilot must stop the train behind the signal and wait for a specific time.

The Loco Pilot must contact the Station Master or Centralised Traffic Control Operator of the next block station. They'll check for any obstructions ahead and grant permission to proceed.

The Loco Pilot must use the prescribed whistle code, exchange signals with the Guard, and proceed cautiously.

The Guard must display a Stop hand signal to the rear of the train when it stops at an Automatic Stop signal.

The Loco Pilot must proceed with extreme caution, as if they were driving through an unsafe area, until the next Stop signal.

The Loco Pilot must maintain a very slow speed, not exceeding 10 kilometers per hour, when visibility is poor.

The Loco Pilot can request the Guard to accompany them to the engine cab to look out for potential obstructions.

Special instructions may override the standard procedures. The Loco Pilot should always follow any additional instructions related to Automatic Stop signals.

When a train encounters an 'ON' Automatic Stop signal, the Loco Pilot must bring the train to a stop as close as possible to the rear of the signal, maximizing the buffer zone for a train following behind.

After passing an 'ON' Automatic Stop signal, the Loco Pilot of the following train must maintain a minimum distance of 150 meters or two clear OHE spans from the preceding train or any obstruction.

The minimum safe distance requirement can be reduced to 75 meters or one clear OHE span for EMU/MEMU trains following.

In case of special circumstances like floods, the following train can be pulled closer to the preceding train or the obstruction, but only after a specific caution order is issued.

The Guard must monitor the Loco Pilot's speed after passing an 'ON' Automatic Stop signal and ensure compliance with the prescribed speed limit.

If the Motorman of an EMU/MEMU train exceeds the prescribed speed, the Guard sends a specific bell code warning (three pauses, three rings) and takes further action as required by GR 4.45.

If a Loco Pilot of any other train exceeds the prescribed speed limit, the Guard takes action as per GR 4.45.

The Station Master is responsible for train operation at and between stations on a single line, except when Centralised Traffic Control is in operation.