Questions and Answers
What is the maximum allowable brake-pipe leakage for the second minute?
5 PSI
What must the air brakes be at when a train is originally made up?
100% operative
What percentage of operable air brakes is required on the entire train during Class 1A and Class 2 brake tests?
85%
What is the standard brake pipe pressure at the head end for freight and passenger trains?
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What is the maximum speed freight trains can exceed?
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RFNOCOM is considered a failure message.
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At what brake cylinder piston travel must an air brake be considered inoperative?
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While en route, what percentage of operative air brakes must each train have?
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Who must accept the results of any inspection performed by the mechanical department?
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What must a qualified employee do after completing the Class 1 brake test?
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What is the leakage limit for brake pipe leakage tests?
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When is a Class 1 brake test required?
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Under what conditions is a Class 1 brake test not required?
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What is the required piston travel range for air brakes after a brake pipe reduction of 20 PSI?
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What is the rule about trains previously tested prior to departure concerning further testing?
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When does a Class II air brake test need to be conducted?
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What necessitates a Class III brake test?
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Define a transfer train.
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What can happen to defective equipment during a transfer train air brake test?
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What is the acceptable difference between readouts from the EOT and HTD?
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Freight trains can move on a 2% grade.
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What is a branch pipe cut-out cock?
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Study Notes
Brake-Pipe Leakage Testing
- Measure brake-pipe leakage for one minute; leakage must not exceed 5 PSI in the second minute.
Class 1 Brake Test
- Requires air brakes to be 100% operative when the train is initially formed.
Class 1A and Class 2 Brake Tests
- Entire train's air brakes must be at least 85% operable.
- Tests performed only upon special or verbal instructions.
Standard Brake Pipe Pressure
- Standard head-end pressure is 90 PSI; rear-end is 75 PSI for road freight, transfer, yard, freight, and passenger trains.
Telemetry En-route Restrictions
- Freight trains limited to 30 mph and cannot exceed a 2% grade.
RFNOCOM Telemetry Message
- RFNOCOM (rear to front no communication) is not classified as a failure message.
Inoperative Air Brake Criteria
- Air brake considered inoperative if brake cylinder piston travel exceeds 10.5 inches.
En Route Air Brake Requirement
- Each train must maintain at least 85% operative air brakes while en route.
Acceptance of Mechanical Inspections
- Conductors must accept results from any inspections conducted by the mechanical department.
Class 1 Brake Test Notification
- Qualified employees must notify the crew of successful Class 1 brake tests, documented by the engineer.
Brake Pipe Leakage Measurement
- In leakage testing, brake pipe leakage must not exceed 5 PSI per minute to indicate proper function.
Conditions Requiring Class 1 Brake Test
- Required when train is initially made up or if train consist changes, except with certain minimal adjustments.
Class 1 Test Exemptions
- Not required for block car removals, addition of previously tested cars, or changing motive power.
Brake Pipe Leakage Inspection After Reduction
- After a 20 PSI brake pipe reduction, verify that air brake cylinder piston travel is correct (7 to 9 inches on body-mounted brakes).
Previous Testing Validation
- If a Class 1 test was conducted prior to departure on an outbound locomotive, no further testing is needed unless conditions change.
Class II Brake Test Requirements
- Conducted only when specifically instructed; tests include verifying brake applications and compliance with specific retest rules.
Class III Brake Test Conditions
- Required for separations or when a locomotive/caboose is changed at locations other than initial terminal, among other conditions.
Transfer Train Definition
- A train with an engine and one or more cars that can pick up or drop off at intermediate points, within specified mileage limits.
Transfer Train Air Brake Protocol
- Defective equipment may be moved for repairs if appropriately tagged.
Qualifying Telemetry Standards
- EOT (End of Train) and HTD (Head of Train Device) readouts must not differ by more than 3 PSI.
Freight Train Speed and Grade Restrictions
- Freight trains must not exceed 30 mph and cannot operate on grades greater than 2%.
Branch Pipe Cut-Out Cock Function
- Device used to control the valve operation on a locomotive or car, allowing for cutting in and out.
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Description
This quiz focuses on critical concepts related to railroad brake systems, including testing procedures and operational standards. Master the definitions and requirements for various brake tests essential for train safety.
