Automatic Block System Regulations

A system used on double-track lines where signals are automatically controlled based on the presence or absence of a train in a section of track. This system ensures safe train operation by preventing collisions.

A continuous electrical circuit embedded in the track that detects the presence of a train. Used to control automatic block signals.

An electronic device used to count the number of axles (wheels) passing by a point. It's another way to detect the presence of a train in the automatic block system.

The distance between a train and the next Stop signal that must be clear for a signal to turn to

A signal that indicates a train cannot proceed further unless authorized. This signal is controlled automatically by track circuiting or axle counters.

When a Loco Pilot encounters an Automatic Stop signal at 'On', they must proceed with extreme caution at a speed not exceeding 15 KMPH. They must carefully check for any obstruction, maintain the safe distance, and be prepared to stop immediately.

The guard of the train is responsible for ensuring the Loco Pilot complies with the speed limit after passing an Automatic Stop signal at 'On'.

For EMU trains, the Guard (when not traveling with the Motorman) alerts the Motorman with three pause three rings on the bell code if the speed limit is exceeded.

For trains other than EMUs, the Guard takes action as per General Rule 4.45 if the Loco Pilot exceeds the prescribed speed limit.

After stopping and then passing an Automatic Stop signal at 'On', the Loco Pilot of the following train must maintain a minimum distance of 150 meters or two clear O.H.E. spans from the preceding train or any obstruction.

The minimum distance requirement after passing an Automatic Stop signal at 'On' can be reduced to 75 meters or one clear O.H.E. span for an EMU train following the preceding train.

In special circumstances, like floods, the following train can be pulled closer to the preceding train or obstruction. However, during dense fog, after passing an Automatic Stop signal at 'On', the Loco Pilot/Motorman must ensure a safe distance to observe the flashing tail lamp of the train ahead.

When visibility is poor due to sharp curves, fog, rain or dust storms, the Asst. Loco Pilot (for locomotives) or Guard (for EMUs) must accompany the train on foot until the track ahead is visible.

If the direction of traffic cannot be determined, the person in charge arranges for the correct setting of the route and obtains "Line Clear" permission before allowing a train to proceed.

A signal failure memo is issued along with the "Line Clear" ticket, which grants permission for the train to proceed.

During a total communication failure, the station master and traffic control operator are unable to communicate, and trains must operate according to Rule 6.02 (ii).

If one track is blocked, trains continue on the other track following normal procedures. If possible, they are diverted to the correct line.

Suburban trains will stop ONLY at stations equipped with platforms on the unobstructed through line.

Trains on the local line continue running in their normal direction when both lines are obstructed.

The nearest stations with crossovers control train movement on the through line if both lines are blocked.

Each facing point on the line used for train movement gets clamped and locked. Station Masters confirm the lock status by phone.

Trains on the through line can proceed after a 15-minute interval or as per special instructions. Authority to proceed is given by the Station Master.

The Divisional Railway Manager designates stations where a written authority is required for train departure. This is additional to the 'Authority to proceed'.

Suburban trains only stop at stations with platforms on the through line when both lines are obstructed.

The speed limit for trains on a section of track controlled by the Automatic Block System when visibility is clear.

The speed limit for trains on a section of track controlled by the Automatic Block System when visibility is limited.

The speed limit for trains passing over facing points on a section of track controlled by the Automatic Block System.

A certificate provided by a qualified engineer confirming that a previously obstructed track is now safe for trains.

The person responsible for issuing a message to the stations involved, after receiving confirmation that an obstructed track is clear, to reinstate normal train operation.

The record that documents the suspension of normal working and its resumption on a section of track covered by the Automatic Block System.

When operating on a wrong line under special authorization, the Locomotive Pilot must switch on the flasher light of the train engine.

The process involving inspecting records related to train operation under the Automatic Block System.

When a train needs to run against the established traffic direction, it can only be done with special instructions. These instructions guarantee the track ahead is clear and safe for movement.

In case of a train failure or obstruction on the line, the Loco Pilot must contact the Controller on duty using the field telephone. They must provide details about the situation.

When a train approaches a station on a single line, the Loco Pilot brings the train to a stop behind the First Stop signal and sounds a continuous whistle. If no one responds from the station, the Loco Pilot sends their assistant to inform the station master.

In Automatic Block System territory, trains are only allowed to run in the established direction of traffic. Moving against the traffic flow is prohibited unless there are emergency procedures in place.

Automatic Block System is a technology used on double-track lines where signals are automatically controlled based on the presence or absence of a train. It ensures safe train operation by preventing collisions.

The Loco Pilot, along with the assistance of the guard for EMUs, must ensure the track ahead is visible when visibility is poor due to conditions like fog or rain.

Before resuming regular train operations after an Automatic Block System disruption, all records related to train movement under the special system are to be reviewed and submitted to the Divisional Railway Manager within seven days.