The current standard freight car air brake system.  Also see AUTOMATIC AIR BRAKE.

The operating valve of the AB freight car air brake.  It controls the charging, application and release of the brakes.

To give up. For example, when consignee or shipper relinquishes or gives up damaged freight to carrier; vehicle left on the highway, or disowns or disavows any knowledge of.

Abrasion is the rubbing or wearing away of a surface. Abrasion may also refer to a mark left on a surface. (also see brinelling.).

Antilock Braking System or Anti-Skid Braking System.

A block which a train is not permitted to enter while it is occupied by another train.

ABSOLUTE ERROR

ABSOLUTE ERROR

ABSOLUTE ERROR

ABSOLUTE ERROR