What Do I Do?

tpws

What do i do?

briefing

September 2008

Check red light on TPWS red light flashing

TPWS functionality Acknowledge by pressing the AWS reset button ensure the train is brought to a stand. Red light will go steady for 1 minute before brake release (do not switch the desk in & out to reset)

NO

Approaching a buffer stop

If a driver goes too quickly over an active overspeed sensor or passes a TPWS fitted red signal, the brakes will apply and the brake demand indicator will flash. The brake application is acknowledged by pressing and releasing the AWS reset button, at which point the brake demand light reverts to steady. When the system has timed out (60s after the brakes have been applied), the brakes release and the brake demand light switches off.

YES

has timed out (60s after the brakes have been applied), the brake release and the brake demand light switches off. Please remember that all types of TPWS/AWS activations must be reported to the signaller before continuing your journey, this must then be backed up with a written report submitted to the production manager before the end of duty.

If a driver has a brake application due to being late to acknowledge the AWS horn, the brakes will apply and the brake demand light will flash. Do not move, contact the signaller

Move forward to the normal stopping point

Work to instructions received from signaller

Contact the signaller

Once the driver has acknowledged the AWS horn by pressing the reset button, the brake demand light will revert to a steady state. After the system

Visual

Fill out report form before leaving duty

Train Stop

Overspeed

AWS

Flashing (Steady when acknowledged)

Flashing (Steady when acknowledged)

Flashing (Steady when acknowledged)

Audible alarm & acknowledgement Reset

DMC2249

AWS horn and press AWS reset button Press AWS reset button

Press AWS reset button

Unexpected brake applications If your train has been brought to a stand by an unexpected brake application, not made by yourself, you must immediately check the in cab equipment indications, such as AWS or TPWS. This will confirm whether an intervention has occurred. Your indication that an intervention has occurred are either the TPWS brake demand light flashing or if previously acknowledged a steady light. This event data will automatically be stored on the OTDR equipment, now comprehensively reviewed daily. If there has been an intervention, you must carry out the instructions in section 2, Module S3 Train warning systems (AWS and TPWS) and reporting signaling failures and irregularities. For your information this procedure is listed below. When an automatic brake application is initiated as a result of the operation of TPWS, you must : •

Acknowledge the TPWS brake demand

•

Make sure the train comes to a stand

• Immediately tell the signaller what

has happened • Carry out the instructions you are given by

the signaller • Not make any further movement of the train

until instructed. The signaller will also ask a few set questions. This is intended to capture any immediate information available and address any immediate risks.

If your train is brought to a stand by an emergency brake application initiated by yourself. You still must immediately check the in cab indications such as AWS or TPWS to see if this equipment has activated. If it has you must follow the procedure above.

TPWS operation when approaching buffer stops When an automatic brake application is initiated as a result of the operation of TPWS when approaching buffer stops, you must: •

• after the train has come to a stand, move

forward to the normal stopping point if it is safe to do so

Once again remember OTDR will identify if this has occurred. If you are certain that the AWS or TPWS equipment has not activated you must still make every effort to report the emergency brake application to the signaller, however do not delay your service if unable to do so. Instead you must report the incident to the signaller as soon as practicable. Remember that you must complete a report of the incident by the end of your duty.

acknowledge the TPWS brake demand

•

tell the signaller what has happened

• carry out the instructions you are given by

the signaller.

Emergency brake application initiated by the passenger communication apparatus (PCA) If the train is stopped because the PCA has been operated, you must: • Find out the reason for the PCA being used and take

appropriate action • If practicable, get the name and address of anyone misusing the

equipment and any witnesses. You must tell the signaller about the circumstances. you must reset the pca before the train restarts .

It is important to remember that these are not new requirements but a simple reminder of the procedures that you should be following. If you are unsure of what is required it is important that you contact your driver manager. Continued over