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Questions and Answers
What does the isolating cock (86) supply air to?
What does the isolating cock (86) supply air to?
Which gauge indicates the main reservoir pressure at port W?
Which gauge indicates the main reservoir pressure at port W?
What component is indicated by gauge (132)?
What component is indicated by gauge (132)?
What is the role of the reducing valve (79) in the system?
What is the role of the reducing valve (79) in the system?
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What is the purpose of vented isolating cocks in the headstock?
What is the purpose of vented isolating cocks in the headstock?
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What is the primary purpose of the safety valve in the pneumatic system?
What is the primary purpose of the safety valve in the pneumatic system?
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Which component is responsible for removing condensate from the air after it passes through the main reservoirs?
Which component is responsible for removing condensate from the air after it passes through the main reservoirs?
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What role does the unloader valve play in the pneumatic system?
What role does the unloader valve play in the pneumatic system?
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What is the function of the twin tower air dryer in the pneumatic system?
What is the function of the twin tower air dryer in the pneumatic system?
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Which of the following is true about the isolating cock used in the pneumatic system?
Which of the following is true about the isolating cock used in the pneumatic system?
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How many compressors are present in the WAP5 Bo-Bo Passenger Locomotive's pneumatic system?
How many compressors are present in the WAP5 Bo-Bo Passenger Locomotive's pneumatic system?
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In which component is dust removed from the air after passing through the air dryer?
In which component is dust removed from the air after passing through the air dryer?
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What is the primary function of the choke in the sand injector system?
What is the primary function of the choke in the sand injector system?
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How does the anti-slip valve respond when an axle set slips?
How does the anti-slip valve respond when an axle set slips?
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What is the typical release time for the anti-slip valve after it engages?
What is the typical release time for the anti-slip valve after it engages?
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What supplies the air for the windscreen wipers?
What supplies the air for the windscreen wipers?
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Which component is used to provide the feed to the antislip valves?
Which component is used to provide the feed to the antislip valves?
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What happens when there is a demand for air from the E70 brake unit?
What happens when there is a demand for air from the E70 brake unit?
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How long is the typical time taken for the brake cylinder pressure to build up using the anti-slip valve?
How long is the typical time taken for the brake cylinder pressure to build up using the anti-slip valve?
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Which component is responsible for handling the sand application in a controllable manner?
Which component is responsible for handling the sand application in a controllable manner?
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What role does the double check valve play in the brake system?
What role does the double check valve play in the brake system?
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What component provides the air supply for the automatic air brake application?
What component provides the air supply for the automatic air brake application?
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Which valve is responsible for directing air to the pantographs after it leaves the brake frame?
Which valve is responsible for directing air to the pantographs after it leaves the brake frame?
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What is the function of the pressure switch in the pantograph circuit?
What is the function of the pressure switch in the pantograph circuit?
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What happens when the main reservoir pressure exceeds the pressure switch maximum setting?
What happens when the main reservoir pressure exceeds the pressure switch maximum setting?
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Which component acts as a connection point for the brake cylinder pressure switch?
Which component acts as a connection point for the brake cylinder pressure switch?
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How is the auxiliary compressor activated when main reservoir air is not present?
How is the auxiliary compressor activated when main reservoir air is not present?
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What is the purpose of the centrifugal strainer in the pantograph air supply system?
What is the purpose of the centrifugal strainer in the pantograph air supply system?
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What happens to the air supply after it passes through the vented isolating cock in the pantograph system?
What happens to the air supply after it passes through the vented isolating cock in the pantograph system?
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Which port on the brake frame is the pantograph air supply taken from for normal operation?
Which port on the brake frame is the pantograph air supply taken from for normal operation?
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Where does the air supply for the pantographs go after leaving the brake frame?
Where does the air supply for the pantographs go after leaving the brake frame?
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What initiates an emergency brake application when the EP valve de-energizes?
What initiates an emergency brake application when the EP valve de-energizes?
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What function does the relay valve serve in the braking system?
What function does the relay valve serve in the braking system?
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When does the dynamic brake cut out EP valve become energized?
When does the dynamic brake cut out EP valve become energized?
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What is the role of the emergency (vigilance) cock in the system?
What is the role of the emergency (vigilance) cock in the system?
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What prevents duplication of braking effort of both dynamic and automatic air brakes?
What prevents duplication of braking effort of both dynamic and automatic air brakes?
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What happens when the driver operates the push button (PVEF) in the cab?
What happens when the driver operates the push button (PVEF) in the cab?
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Where does the distributor take its air supply from?
Where does the distributor take its air supply from?
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What is the purpose of the auxiliary reservoir's manual drain valve?
What is the purpose of the auxiliary reservoir's manual drain valve?
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What is the expected output ratio of the relay valve compared to the signal received from the distributor?
What is the expected output ratio of the relay valve compared to the signal received from the distributor?
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What occurs if an emergency brake application is made after a full service application?
What occurs if an emergency brake application is made after a full service application?
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Which component in the list has the highest quantity provided?
Which component in the list has the highest quantity provided?
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What is the quantity of the 'Pantograph' listed in the components?
What is the quantity of the 'Pantograph' listed in the components?
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Which item is specifically described as having a vented feature?
Which item is specifically described as having a vented feature?
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Which component is listed twice with distinct quantities?
Which component is listed twice with distinct quantities?
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Which component listed is related to both the air system and emergency functioning?
Which component listed is related to both the air system and emergency functioning?
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What is the primary function of the low main reservoir governor in the circuit?
What is the primary function of the low main reservoir governor in the circuit?
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How does the main reservoir equalizing pipe function in the system?
How does the main reservoir equalizing pipe function in the system?
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At what pressure do the compressor governors operate with respect to compressor (35)?
At what pressure do the compressor governors operate with respect to compressor (35)?
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What is the role of the duplex check valve in the main reservoir system?
What is the role of the duplex check valve in the main reservoir system?
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Which component directly connects to the brake frame via port X?
Which component directly connects to the brake frame via port X?
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What happens when the air supply is redirected via the isolating cock (94)?
What happens when the air supply is redirected via the isolating cock (94)?
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Which element is responsible for ensuring that pressure levels are maintained in both compressors?
Which element is responsible for ensuring that pressure levels are maintained in both compressors?
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What is the role of the auxiliary compressor in the pantograph system?
What is the role of the auxiliary compressor in the pantograph system?
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Which component directly relays air from the automatic air brake to the main bogie air supply pipe?
Which component directly relays air from the automatic air brake to the main bogie air supply pipe?
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What condition triggers the pressure switch (26) in the auxiliary compressor control?
What condition triggers the pressure switch (26) in the auxiliary compressor control?
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Which port on the brake frame is associated with the pantograph air supply?
Which port on the brake frame is associated with the pantograph air supply?
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What function does the throttle valve (80) serve in the pantograph air supply system?
What function does the throttle valve (80) serve in the pantograph air supply system?
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What is the primary function of the pressure switch (9) in the pantograph circuit?
What is the primary function of the pressure switch (9) in the pantograph circuit?
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Which component ensures that the auxiliary compressor does not operate unnecessarily?
Which component ensures that the auxiliary compressor does not operate unnecessarily?
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Which valve operates downstream of the bogie isolating cock to assist in brake cylinder pressure management?
Which valve operates downstream of the bogie isolating cock to assist in brake cylinder pressure management?
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What happens to the air supply after it passes through the check valve (25)?
What happens to the air supply after it passes through the check valve (25)?
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In the context of pantograph operation, what is indicated by the status signal sent to the ABB central electronics?
In the context of pantograph operation, what is indicated by the status signal sent to the ABB central electronics?
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What is the primary function of the sub-manifold on the brake frame?
What is the primary function of the sub-manifold on the brake frame?
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Which gauge provides a reading of the flow demand in the braking system?
Which gauge provides a reading of the flow demand in the braking system?
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What happens to the air after passing through the EP valves for flange lubrication?
What happens to the air after passing through the EP valves for flange lubrication?
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How is the isolating cock system designed in case of damage to external headstock cocks?
How is the isolating cock system designed in case of damage to external headstock cocks?
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What type of pressure does gauge (121) indicate in the cab instrumentation?
What type of pressure does gauge (121) indicate in the cab instrumentation?
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What is the role of the isolating cocks (68), (88), and (125) in the system?
What is the role of the isolating cocks (68), (88), and (125) in the system?
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What is indicated by a heavy flow demand on the flow meter gauge?
What is indicated by a heavy flow demand on the flow meter gauge?
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Which component is responsible for directing air from the reducing valve to the isolating cocks?
Which component is responsible for directing air from the reducing valve to the isolating cocks?
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How does the flexible hose (83) contribute to the lubrication system?
How does the flexible hose (83) contribute to the lubrication system?
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What is the purpose of dummy couplings (185) provided at the ends of hoses?
What is the purpose of dummy couplings (185) provided at the ends of hoses?
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What is the function of the direct brake isolate valves on the brake frame?
What is the function of the direct brake isolate valves on the brake frame?
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Which port on the brake frame is used for direct brake cylinder pressure?
Which port on the brake frame is used for direct brake cylinder pressure?
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What is the purpose of the 'break-in-two' protection valve in the brake system?
What is the purpose of the 'break-in-two' protection valve in the brake system?
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How is the brake pressure delivered to each bogie from the direct brake relay valve?
How is the brake pressure delivered to each bogie from the direct brake relay valve?
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What role does the anti-slip valve play in the brake system?
What role does the anti-slip valve play in the brake system?
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What happens to the air supply from the direct brake pipe on the trailing locomotive?
What happens to the air supply from the direct brake pipe on the trailing locomotive?
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Which components interface with the automatic air brake application?
Which components interface with the automatic air brake application?
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What indicates the output pressure from the brake valve in the brake system?
What indicates the output pressure from the brake valve in the brake system?
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What component allows the direct brake to be applied on the trailing locomotive?
What component allows the direct brake to be applied on the trailing locomotive?
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Study Notes
Pneumatic System
- WAP5/WAG9 locomotives use a pneumatic system integrated with electronic controls supplied by Davies & Metcalfe
- Systems are similar, except for minor differences in brake rigging arrangement based on the locomotive bogie type (Bo-Bo or Co-Co)
Air Supply
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Two 2A320D electrically driven air compressors feed the main reservoir system through flexible hoses and check valves
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Each compressor leg includes a safety valve and an unloader valve (operated by an electro-pneumatic valve).
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Air passes through a water separator (with auto drain valve) into two main reservoirs (with manual and auto drain valves)
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Air then passes through a vented isolating cock, a twin-tower air dryer, and a final filter before passing through another isolating cock
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Main reservoir system includes a safety valve, two compressor governors, and a low main reservoir governor. Governors are used to control compressor operation between set pressure ranges (10 kg/cm² and 8 kg/cm² or 7.5 kg/cm² and 10 kg/cm²) to prevent overpressure.
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The main reservoir supply splits. One leg goes to another 240-liter main reservoir, passing through a check valve and further components including an in-line filter. This leg supplies the pilot supply for direct brake isolating valves, the pilot supply for the brake cylinder cutout valve, the main reservoir supply for the direct relay valve, and the main reservoir supply for the blending valve.
Traction Rolling Stock: Three Phase Technology
- The duplex check valve allows one locomotive to feed the main reservoir system with another in case of a compressor failure, allowing air transfer between locomotives in a consist.
- The main reservoir equalizing pipe feeds protection valve 46, brake feed pipe regulator (regulator 137 and relay valve 93), and sanding equipment. This design allows for emergency brake application and consistent air pressure throughout the train.
- The air supply for the distributor (49) and the automatic brake relay valve (57) is taken from the auxiliary reservoir (51) and is charged via check valve (106) from the main reservoir.
- The auxiliary reservoir (51) is used to ensure that when the locomotive is not connected to a main train, parking brake pressures can be safely released.
Parking Brake
- Parking brake air is supplied from the auxiliary reservoir, using a reducing valve and latched solenoid valve.
- Enables the parking brake application on both locomotives in a multiple consist, utilizing manual and automatic functions.
Brake Blending
- Locomotives have the facility to blend dynamic and air brakes, dynamically adjusting air pressure levels if a dynamic braking failure occurs.
Direct Brake
- Direct brake valves are supplied air from port H on the brake frame.
- Direct brake isolate valves are a crucial element for controlling the flow of air within the direct brake system.
- The direct brake system utilizes a "break-in-two" protection valve to ensure isolated operation for safety during train operation.
- The direct brake system is designed to operate in a way that prevents any improper air pressure manipulation that could lead to system failure.
Brake Cylinder Feeds
- Brake cylinder pressure comes from the brake frame, passing through components like a choke (67), isolation cocks, and double check valves to provide air to the bogies.
- System incorporates automatic air brake application interfaces
Pantograph equipment
- Pantograph air supply comes from the main reservoir (via check valve).
- There's a secondary air supply for stable pantograph operation if the main reservoir fails
Auxiliary Air Supplies
- Additional sub-manifold provides compressed air to electrical equipment, including flange lubrication.
Cab Instrumentation
- Four gauges in each cab provide driver information about main reservoir pressure, brake pipe pressure, brake cylinder pressure, and flow meter differential.
End Connection Protection
- Dummy couplings and vented isolating cocks are used to isolate individual parts of the train's brake system, preventing damaging pressure surges.
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Description
This quiz explores the pneumatic systems used in WAP5/WAG9 locomotives, focusing on their integration with electronic controls. It covers the air supply mechanisms, including compressors, reservoirs, and safety features essential for locomotive operations.
