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Quizzes > General Knowledge & Mixed

Railroad Switch Test Practice for CN USOR Rules

Quick, free signals test practice. Instant results.

Editorial: Review CompletedCreated By: Sam AdekUpdated Aug 25, 2025
Difficulty: Moderate
2-5mins
Learning OutcomesCheat Sheet
Paper art illustration for a conductor practice test quiz on CN USOR regulations and railroad safety on sky blue background.

This railroad switch test practice quiz helps you prepare for CN USOR rules and safe switching. Answer 25 realistic questions on signals, hand throws, and procedures, then see instant results with brief explanations to spot gaps fast. For more study, work through our train conductor practice test or sharpen signal knowledge with a railroad signaling test.

Under CN USOR, what does displaying a Blue Signal mean?
Equipment is under repair and must not be moved
Warns of low clearance ahead
Indicates the track is out of service
Proceed at restricted speed
The Blue Signal is used to protect personnel working on or under equipment by prohibiting movement of that equipment. It must be displayed at each end of the track where work is being done. Removing or bypassing a Blue Signal without proper authority is a serious safety violation.
What hand signal generally indicates a "Back Up" movement?
Arm raised and waved above the head
Arm extended horizontally and moved in small circles
Both arms crossed in front of body
Arm extended downward and moved side to side
The handler signals for a backing movement by extending the arm horizontally and moving in small circular motions. This clear motion helps the engineer understand that the movement is a reverse direction. Standardized hand signals reduce confusion during switching operations.
What horn signal sequence is used to alert an immediate emergency?
One short, one long, one short
Continuous sounding of the horn
Two long, one short, one long
One long, two shorts, one long
A continuous sounding of the horn is the standardized emergency signal to warn of immediate danger. It alerts anyone in the vicinity that an emergency condition exists. Deviating from this can delay response and endanger personnel.
What is the standard maximum speed limit within CN yard limits unless otherwise posted?
15 mph
35 mph
25 mph
45 mph
Within yard limits, the maximum speed is generally restricted to 15 mph to enhance safety during switching and complex movements. This limit allows crews adequate reaction time in congested areas. Always verify posted speeds as yard speed can be further reduced in certain zones.
What is the purpose of a "derail" on CN track?
To secure cars on a grade
To intentionally derail equipment to protect the track or adjacent property
To indicate the end of track warrant
To signal another train to stop
A derail is a safety device installed on a track to protect mainline operations or adjacent property by intentionally derailing uncontrolled equipment. It prevents runaway cars from entering a protected zone. While it causes equipment damage, it prevents more serious incidents.
When performing a Class I brake test, what is the maximum allowable brake pipe leakage in one minute?
10 psi
5 psi
7 psi
3 psi
During a Class I brake test, the maximum permissible brake pipe leakage is 3 psi over one minute. This limit ensures integrity of the air brake system throughout the train. Exceeding this leak rate requires corrective action before departure.
Before departing a terminal, who is responsible for ensuring the brake test has been properly conducted?
Conductor
Yardmaster
Engineer
Dispatcher
The conductor is responsible for ensuring that all required brake tests have been properly conducted prior to departure. While the engineer operates the brakes, the conductor oversees compliance with safety procedures. This division of duties ensures checks and balances.
Which employees are required to comply with the CN USOR?
Only engineers
Only dispatchers
All employees
Only conductors
CN USOR applies to all employees whose duties involve the safe movement of trains and related operations. Compliance is mandatory regardless of job title. This universal requirement ensures that every individual understands and follows operating rules.
When securing a stationary train on a grade, how many hand brakes must be applied per 20 cars?
Two hand brakes per 20 cars
One hand brake per 10 cars
None if the air brakes are applied
At least one hand brake per 20 cars
CN USOR requires at least one hand brake for every 20 cars when securing on a grade to prevent unintended movement. Additional hand brakes may be required based on gradient and car weight. Relying solely on air brakes can be unsafe in the long term.
What must a conductor verify before entering a controlled main track segment?
There are no maintenance crews nearby
That the train is at maximum authorized speed
That the track surface is dry
Proper dispatcher authority or a clear signal aspect
Prior to entering a controlled main track, the conductor must ensure they have dispatcher authorization or observe a clear signal aspect. This prevents collisions with opposing movements. Other track conditions do not substitute for formal authority.
During a switch movement, a frog is worn and cannot lock properly. What should the conductor do?
Do NOT use the switch and contact the dispatcher for instructions
Apply extra throttle to clear the frog
Use a secondary switch to bypass
Proceed slowly through the switch
If a switch frog cannot lock in the normal position, using it can cause derailments. The conductor must secure the train, place protection, and contact the dispatcher for further instruction. Bypassing safety protocols is prohibited.
What does a flashing yellow over solid yellow signal aspect indicate on CN signal systems?
Clear to proceed at maximum speed
Proceed prepared to diverge at slow speed
Stop
Proceed at restricted speed
A flashing yellow over solid yellow tells the engineer to proceed and be prepared to diverge onto a secondary route at slow speed. It combines caution for the next signal and restriction for the turnout. Misinterpreting this can lead to overspeed on diverging routes.
What is the primary purpose of a switch list in switching operations?
To indicate the current position of each switch within the limits
To track crew assignments
To record fuel consumption
To list all cars in the train
A switch list provides a record of each switch's position within the yard or work limits, ensuring crews know which are lined for normal or reverse. This prevents misrouting and potential derailments. Updating the switch list is required after any change.
If, during a brake pipe recharge after an emergency brake application, the brake pipe does not build pressure, what must the crew do?
Continue to the next station
Sound the horn continuously
Increase throttle to maximum
Secure the train and notify mechanical department
Failure to recharge the brake pipe indicates a system fault that must be addressed before further movement. The train must be secured in place and the mechanical department notified. Operating with unreliable brakes is unsafe.
When coupling equipment on a grade, which precaution must be taken?
Apply additional hand brakes to control movement
Coupling is prohibited under all grades
Activate the blue signal
Use the emergency brake only
Coupling on a grade can cause uncontrolled movement; applying additional hand brakes helps stabilize the cars. The CN USOR requires sufficient mechanical protection before coupling on inclines. Ignoring this can result in runaway equipment.
In CN USOR, what does the term "Foul Time" refer to?
The time before a train arrives
Time period when a track is considered occupied and movement is prohibited
Time allowed for brake tests
Rest period for crew members
Foul Time grants a crew exclusive use of a track segment for maintenance or inspection, prohibiting other movements. It is a form of track authority separate from main track signals. Understanding Foul Time prevents unauthorized entries.
During switching, a normal-position device on a switch has tripped to the non-normal position. What action is required?
Do NOT use the switch and request inspection
Use the switch if manually lined
Ignore and proceed
Continue using the switch at reduced speed
If the normal-position device indicates the switch is not properly lined, using it risks derailment. The switch must be taken out of service and inspected. Proper reporting ensures safety of subsequent movements.
While performing a trainline continuity test, the pressure drops 6 psi in one minute. What is the result?
Continue the journey but monitor closely
The train fails the test and must be reinspected
The train passes the test
Increase air pressure and retest immediately
A pressure drop exceeding 3 psi in one minute causes a failed continuity test under Class I requirements. The defect must be located and corrected before departure. Operating with leaks can lead to brake system failure.
A hand-operated switch target is dark at night. What must the conductor do?
Attempt to manually align the target
Signal to the engineer to proceed
Continue at restricted speed
Stop the train and notify the dispatcher
A dark switch target at night means the switch position is unknown. The crew must stop and inform the dispatcher to prevent misrouting. Proceeding without positive knowledge is a safety hazard.
What is the correct action if excessive drag is observed on a car during a brake test?
Release and reapply brakes
Release the brakes and retest
Continue at reduced speed
Stop and notify mechanical department immediately
Excessive drag indicates a sticking brake cylinder or other defect that can cause wheel flats. The train must be secured and mechanical personnel dispatched for inspection. Ignoring the problem risks equipment damage.
When testing the cab signal system, which indication confirms proper operation?
No light display
Red light only
Flashing blue light
Audible alert and green light display
A functioning cab signal system will display a green indication along with an audible alert, confirming signal pick-up and route alignment. Other indications or no response indicate a system failure requiring immediate correction. Safe operation depends on reliable cab signals.
Under what condition may a conductor proceed at restricted speed through a main track interlocking without authority?
If the previous train has cleared
If interlocking lights are dark
If crew has verbal permission only
It is prohibited; train must have dispatcher authority
Main track interlockings are controlled locations; entering without explicit authority violates CN USOR. All movements must be authorized by the dispatcher or signal indication. Restricted speed alone is not sufficient authority.
What is the maximum allowable temperature rise in brake cylinders during prolonged braking?
200°F above ambient
50°F above ambient
300°F above ambient
No more than 100°F above ambient
Brake cylinders can overheat during extended applications. CN USOR limits the rise to 100°F above ambient to prevent damage and maintain braking efficiency. Exceeding this can lead to brake fade or failures.
When performing a blue signal placement, which of the following is required?
Only on the conductor's side
The blue signal must be attached at each end of the equipment under repair
Blue flag on the ground only
Only at one end
Blue signal protection requires placing a blue signal at each end of the track or equipment where personnel are working. This ensures that movement cannot occur from either direction. Skipping one end defeats the safety purpose.
What is the maximum freight train speed permitted on Class 2 track according to CN USOR?
35 mph
45 mph
15 mph
25 mph
CN USOR designates Class 2 track for freight trains at a maximum of 25 mph. Higher speeds require higher track class. Adhering to speed limits based on track class prevents derailment from track defects.
Per CN USOR Rule 10.3.5, what is the required brake pipe reduction to initiate an emergency application?
10 psi
28 psi
6 psi
18 psi
An emergency brake application is defined by a rapid reduction of 18 psi or more in the brake pipe. This triggers the emergency valve in each car, applying maximum braking. A smaller reduction would only cause a service application.
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Study Outcomes

  1. Understand CN USOR Regulations -

    Master the fundamental rules and guidelines of CN's uniform standards of operating rules to ensure compliance and safety in daily rail operations.

  2. Apply Safe Railroad Procedures -

    Use best practices for track inspections, equipment handling, and emergency protocols to maintain a secure working environment.

  3. Identify Common Hazards -

    Recognize potential track, weather, and equipment risks to proactively address safety concerns before they escalate.

  4. Analyze Signal Indications -

    Interpret various signal types and signage according to USOR standards to make informed decisions on train movement.

  5. Evaluate Crew Communication -

    Assess and improve radio procedures and hand”signal coordination to enhance teamwork and operational efficiency.

  6. Demonstrate Exam Readiness -

    Simulate real testing conditions with our 25”question quiz to build confidence and identify areas for further study.

Cheat Sheet

  1. Fundamentals of CN USOR Air Brake Tests -

    Review mandatory Class I air brake tests outlined in CN USOR Section 138.10 and FRA 49 CFR 232 to verify brake pipe reductions of 15 psi within 15 seconds for a 100-car train. Use the mnemonic ΔP = R × T (Pressure drop = Rate × Time) to remember application and release rates. Consistent brake cylinder pressure above 70% of full service ensures reliable stopping power.

  2. Hand Signal and Radio Communication Protocols -

    Solid conductor exam prep includes mastering official hand signals from the Canadian Rail Operating Rules (CROR) Section 30 and CN USOR guidelines to ensure clear, nonverbal crew communication. Pair each gesture with a radio call sign (e.g., "Go - Engine One Off") to reinforce understanding during a conductor practice test or railroad safety quiz. A helpful mnemonic is "Yes/No/Slow/Stop" in sequence to drill common commands under pressure.

  3. Train Securing Procedures on Grades -

    In CN USOR Section 137.3, secure equipment using the three-point method: Apply air brakes, set hand brakes, and chock wheels when required. Use the memory aid "AHS" (Air, Hand, Secure) to recall each step under exam conditions. Understanding slope tables and minimum hand brake counts (e.g., one brake per ten cars) is vital for safe operations.

  4. Hazardous Materials Handling and Placarding -

    Familiarize yourself with the Transportation of Dangerous Goods Act classifications and CN USOR Section 501 to identify placard classes and emergency response guides (ERG). Practice labeling a tanker car with the correct placard number (e.g., Class 3 for flammables, ERG 127) during your rail operations test. This foundation boosts confidence for any CN USOR practice quiz on hazardous materials.

  5. Locomotive Pre-Departure Inspection Checklist -

    Master the 22-point inspection outlined in CN USOR Section 161, covering brake rigging, traction motors, lighting, and fluid levels. Use the acronym "BATTLE FL" (Brakes, Air, Traction, Truck, Lights, Electrical, Fluids) to work through each item systematically. Practicing this checklist in a conductor practice test scenario improves retention and speeds up real-world inspections.

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