Even numbered cars on R44/R46 equipment which contains operating positions, compressor and converter. Also, in general refers to cars with motorman operating positions.

The numbered lines of the New York subway, formerly known as the IRT.

Abandoned interval due to no available train or no crew.

A section of track upon which a train is NOT permitted to enter upon while it is occupied by another train. Used most often in single-track operations.

Americans with Disabilities Act. Federal law requiring handicapped access to all public spaces, including subways and buses.

Assistant Train Dispatcher.

Additional Vacation Allowance. When a holiday falls on a workday and you have to work, you can either get paid for the holiday and your normal workday pay or you can save the holiday- meaning no extra [..]

Odd numbered cars on R44/R46 equipment. These cars are only trailers - they have no operating position. Also, in general refers to cars with no motorman operating position.

The lettered lines of the New York subway, formerly known as the BMT and IND.

Brakes in Emergency. Refers to an unwanted application of the train's emergency air brakes.