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Questions and Answers
What is the purpose of shutting down power at track level to the traction power rail?
What is the purpose of shutting down power at track level to the traction power rail?
- To perform routine maintenance on the traction power rail
- To respond to an emergency situation at track level (correct)
- To allow personnel to travel along the track safely
- To increase the power supply to subway trains
Where are Emergency Alarm Stations located?
Where are Emergency Alarm Stations located?
- At the ends of all Subway and Rapid Transit platforms, and at 150-metre intervals in track level tunnels and open cut sections (correct)
- Only in track level tunnels and open cut sections
- Near exit points only
- Only at the ends of Subway and Rapid Transit platforms
What is the purpose of the blue lights at each EAS?
What is the purpose of the blue lights at each EAS?
- To identify the location of the EAS (correct)
- To signal an emergency
- To provide lighting in dark tunnels
- To indicate whether the power is on or off
What contains a PAX phone and an emergency power cut/trip device?
What contains a PAX phone and an emergency power cut/trip device?
What happens when an EAS emergency power cut/trip device is activated?
What happens when an EAS emergency power cut/trip device is activated?
What information is displayed above each EAS at track level?
What information is displayed above each EAS at track level?
What happens to power in adjacent storage tracks during an emergency?
What happens to power in adjacent storage tracks during an emergency?
What is the purpose of PAX phones in subway tunnels and stations?
What is the purpose of PAX phones in subway tunnels and stations?
What should firefighters use to report their location at an emergency scene?
What should firefighters use to report their location at an emergency scene?
What is the function of Power Control in the TTC Transit Control Centre?
What is the function of Power Control in the TTC Transit Control Centre?
What step should be taken before proceeding from platform level to track level during an emergency?
What step should be taken before proceeding from platform level to track level during an emergency?
What happens to vehicle movement in the area after a power cut/trip?
What happens to vehicle movement in the area after a power cut/trip?
Why should firefighters leave the PAX phone off the hook?
Why should firefighters leave the PAX phone off the hook?
What should firefighters be aware of regarding track switches?
What should firefighters be aware of regarding track switches?
How long do trains have backup power after a power cut?
How long do trains have backup power after a power cut?
What happens to passengers on a train in a tunnel when power is cut?
What happens to passengers on a train in a tunnel when power is cut?
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Study Notes
Emergency Procedures in the Subway System
- An emergency power cut/trip is the process of shutting down power at track level to the traction power rail (third rail), which powers subway trains.
Emergency Alarm Stations (EAS)
- EAS are located at the ends of all Subway and Rapid Transit platforms and at 150-metre (500 ft.) intervals in track level tunnels and open cut sections.
- Blue lights identify the location of every Emergency Alarm Station.
- Each EAS contains a PAX phone and an emergency power cut/trip device.
- The emergency power cut/trip device is a power disconnect that disengages the traction power rail (third rail) power breakers.
Types of Emergency Power Cut/Trip Devices
- There are three types of Emergency Power Cut/Trip Devices that immediately cut power on both tracks in both directions and to adjacent storage tracks.
- A visual and audible alarm is triggered at TTC Transit Control Center.
PAX Phones
- PAX is an abbreviation for 'Passenger' and refers to phones spaced throughout subway tunnels and stations for internal communication.
- To call any internal TTC phone, dial the last four digits of the number (e.g., '3555' for TTC Transit Control Centre).
- Firefighters should use the information on the PAX phone when reporting their location at an emergency scene.
Power Control
- Power Control, located within the TTC Transit Control Centre, controls the Subway ventilation system and monitors electrical substations that generate and distribute 600 Volt DC traction power.
- Power Control advises on the extent of power cuts and when vehicle movement in the area has stopped.
Emergency Power Cut/Trip Protocol
- Locate the EAS and utilize the PAX phone to connect with TTC Transit Control Centre before cutting power.
- Provide name, position, location, and reason for the power cut/trip to TTC Transit Control Centre.
- TTC Power Control advises on the location and ensures that vehicle movement in the area has stopped.
- Record the name of the TTC staff confirming the power cut/trip.
- Leave the PAX phone off the hook and transmit via radio to the TFS Incident Commander or TFS Communications that power has been cut.
- Activate the power cut/trip at each EAS when traveling further into the tunnel.
Safety Precautions
- The power traction rail (third rail) should always be treated as live.
- Firefighters should remain between the running rails and be aware that track switches can continue to operate, even with power cut, creating a severe pinch hazard.
Emergency Backup Power on Trains
- Trains have three hours of backup battery power after the power cut, which powers emergency systems, lights, heating, and air conditioning but does not allow the train to be moved.
- TTC will attempt to stop trains at station platforms for ease of evacuation.
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