NS Air Brake Test study plan

Label every major component of a freight air brake system (compressor, main reservoir, feed valve, brake valve, equalizing reservoir, brake pipe, auxiliary reservoir, emergency reservoir, control valve, brake cylinder, slack adjuster, retaining valve) on a blank schematic drawn from memory

Explain in writing how a brake pipe pressure reduction causes a control valve to move to service position and admit auxiliary reservoir air to the brake cylinder

Trace the path of air from main reservoir to brake cylinder during a service application and during a release, describing what each valve does at each step

Describe the function of the feed valve, equalizing reservoir, and regulating valve in maintaining brake pipe pressure and list the typical calibrated pressures for freight service

Define brake pipe, brake cylinder, and auxiliary reservoir leakage and state which one the control valve is designed to compensate for

Explain the difference between direct release and graduated release, and state which freight equipment uses each

Describe how a 10-pound brake pipe reduction differs in effect from a 20- or 30-pound reduction, including brake cylinder pressure buildup timing

Sequence the steps of a proper brake application: throttle/DB setup, minimum reduction, bail-off or independent as applicable, and waiting for equalization

Identify what happens to brake cylinder pressure when brake pipe pressure is reduced too slowly versus too quickly, and explain the risk of each

Practice on a simulator or training stand: make a minimum reduction, a full service reduction, and a release, and record actual brake cylinder pressures observed

Define brake pipe leakage and state the maximum allowable leakage rate for a train in freight service, verifying the current figure against your railroad's timetable or air brake rulebook

List the conditions that must be met before a leakage test is valid (charged train, angle cocks closed, flow meter or gauge reading stabilized)

Describe the procedure for conducting a brake pipe leakage test from the head end, including how to read the flow indicator or brake pipe gauge over a timed interval

Explain the pressure retention test: what it checks, when it is required, and how a leaking or sticking control valve is identified from retention test results

Distinguish between brake pipe leakage that is within limits and leakage that requires corrective action, and state the reporting steps for each

Define Class I, Class II, and Class III brake tests and state the trigger conditions for each (initial terminal, intermediate, and road/transfer terminal situations)

List the required inspection points and tests performed during a Class I initial terminal brake test from the head end to the rear of the train

Describe the Class II test requirements, including what must be inspected and which tests may be reduced compared to Class I

Describe the Class III test and identify when a train may proceed under it versus when a full Class I is required

Explain the role of the rear-end device or end-of-train telemetry in verifying brake pipe pressure and brake application during a test

Walk a train (or use a training consist) and perform the mechanical inspection sequence: hoses and couplings, angle cocks, brake rigging, slack adjusters, pistons, and retaining valves

Identify at least ten common bad order conditions (leaking hose gasket, cut or chafed hose, stuck brake piston, misaligned slack adjuster, missing cotter key, defective retaining valve, damaged uncoupling lever, improper piston travel) and state the corrective action for each

State the acceptable brake cylinder piston travel range for the equipment you work with and explain how to measure it

Describe the procedure for setting out a bad order car, including how to secure it, what to document, and who must be notified

Explain how a defective air brake component found during a test affects the train's ability to depart and what the rules require

Explain the rules governing brake applications before descending a grade, including when to apply brakes and how to verify they are set

Describe proper use of dynamic brakes, independent brake, and automatic brake in combination, and state the rule-based limits on each

List the required actions when a train experiences an undesired emergency brake application, including protection, inspection, and reporting

State the rules on charging a train, minimum brake pipe pressure at the rear, and communication with the rear end before departure

Recite from memory the key air brake rules covering brake pipe leakage limits, piston travel, and brake test intervals, citing rule numbers

Describe the hazards of working around air brake equipment: stored energy in reservoirs, hose whipping, sudden release of couplings, and pinch points in brake rigging

Explain the procedure for protecting a train that is stopped on a grade or in a block, including flagging or signal protection requirements

Describe the steps for responding to a hose separation or unintended emergency application en route, including securing the train and inspecting the brake system before proceeding

Identify personal protective equipment and safe walking/working practices required during a brake test at night or in inclement weather

Explain how to report a hazardous condition involving air brake equipment and what information must be conveyed

Complete a full-length timed practice test covering all seven domains and score each domain separately

Re-study every missed question by locating the governing rule or component principle and writing a corrected explanation

Re-demonstrate the Class I brake test sequence and the leakage test procedure end to end without notes

Review the comparison table, bad order log, flashcard set, and drill sheet, correcting any outdated figures against the current rulebook

Build a one-page quick-reference sheet of critical numbers: leakage limits, piston travel ranges, calibrated pressures, and test intervals