NYC Transit Train Operator key terms

A signal system in which only one train is permitted in a defined block of track at a time. The block stays occupied until the train clears it and the signal returns to a safer aspect.

A wayside signal arrangement in which track circuits detect trains and automatically set signals to stop behind occupied blocks, letting trains follow each other without a dispatcher issuing every movement.

A length of track between two signals or between a signal and the end of signaled territory. Its boundaries let the railroad keep following trains separated by a fixed distance.

An electrical circuit that runs through the rails. A train's steel wheels short the circuit and show the block as occupied, which is how signals and control centers detect a train's location.

An arrangement of signals and switches that are mechanically or electrically locked so conflicting routes cannot be set at the same time. It protects junctions, crossovers, and terminal throats.

A signal placed at the entrance to an interlocking or block that governs whether a train may enter that protected territory. It displays stop until a route is set and locked.

A signal placed in advance of a home signal to give warning of the aspect the home signal displays. It allows the operator to begin braking before reaching the stop point.

The appearance of a signal, such as the color, position, or flashing pattern of its lights, that conveys the indication and the required action to the train operator.

The meaning or instruction conveyed by a signal aspect, such as proceed, proceed with caution, or stop. Operators must act on the indication, not merely the color seen.

The location near a switch or crossing beyond which a standing train would be too close to an adjacent track and could be struck by traffic on that track. Trains must stop clear of it.

A track device with movable rails that lets trains move from one track to another. It must be properly lined and, where required, locked before a train passes over it.

A track safety device placed on a rail to intentionally guide equipment off the track, preventing unattended cars from rolling onto a main track or into an area where they could collide.

The distance a train travels from the moment brakes are applied until it stops. It grows with speed, train weight, and poor rail conditions, so operators must plan stops well in advance.

A normal, controlled brake application used to slow or stop a train smoothly. It is distinct from an emergency application, which applies maximum braking force as quickly as possible.

A full, immediate brake application made to stop the train as fast as possible in response to danger. It vents air rapidly and must be followed by the required reporting and inspection procedures.

A safety device, such as a pedal or handle, that the operator must keep depressed or held while the train is moving. Releasing it automatically applies the brakes.

A signal displayed inside the operator's cab that repeats or supplements wayside signal information. It allows the operator to receive movement authority even when wayside signals are hard to see.

The required check of a train's equipment before it enters service, covering brakes, lights, doors, horn, and safety devices. Defects found must be reported and corrected before departure.

A procedure that confirms the train's braking system applies and releases correctly throughout the consist. It verifies brake pipe pressure and that each car's brakes respond as intended.

A tag placed on equipment to record a known fault so it is not overlooked and is repaired by maintenance personnel. It documents what is wrong and when it was found.

A systematic process of identifying the cause of an equipment problem by observing symptoms, checking likely causes in order, and applying the correct corrective action or reporting procedure.

An electrified rail alongside the running rails that supplies traction power to the train through contact shoes. It is a serious electrical hazard and must never be touched.

The structure beneath and around the tracks, including ballast, ties, and drainage. Walking conditions and clearance hazards on the roadbed affect how safely employees can move trackside.

The set of rules and procedures that keep employees safe while working on or near tracks, including obtaining permission, establishing protection, and using warning methods before trains pass.

The controlled removal of passengers from a train during an emergency, such as fire or smoke. It requires securing power, choosing a safe route, and coordinating with the control center.

The operations facility that monitors train movements, sets routes, and directs operators during normal service and emergencies. Operators report unusual conditions and follow its instructions.

The standard way of communicating by radio, using clear identification, concise wording, and read-back of critical instructions to prevent misunderstanding between operator and control center.

Repeating a received instruction or authority back to the sender to confirm it was heard correctly. It is required for safety-critical messages such as movement authority and speed restrictions.

Permission for a train to move over a specified portion of track, up to a stated limit. It may come from a signal indication or from a dispatcher's verbal instruction.

A temporary or permanent limit on how fast a train may travel over a section of track, often due to work or track condition. Operators must reduce speed before reaching the restriction.

The time a train spends stopped at a station while passengers board and exit. Managing dwell time helps keep the schedule and prevents platform crowding and door incidents.

The space between the edge of the platform and the side of the stopped train. Operators must position the train carefully and warn passengers because the gap can cause falls.

Anything caught in a train door that prevents it from closing fully. Operators must detect and clear obstructions before moving, since dragging a passenger is a severe hazard.

The operator's ongoing perception of track conditions, signals, passengers, and their own train's state, plus the ability to anticipate what could go wrong next and act early.

The practice of keeping attention on operating the train by avoiding phone use, unnecessary conversation, and other interruptions that could cause a missed signal or stop.

A written record of an unusual event such as an injury, evacuation, or equipment failure. It states what happened, when, where, who was involved, and what actions were taken.

The rate at which a train's speed increases. It depends on traction power, train weight, and grade, and it affects station-to-station running time and stopping calculations.

The slope of a section of track, expressed as rise over run or as a percentage. Uphill grades reduce acceleration, while downhill grades increase stopping distance.