APTA PR-M-S-024-19

This standard was prepared by the American Public Transportation Association in cooperation with its member railroads and the supply industry. This standard defines the requirements for an intratrain communications system for passenger equipment in revenue interchange service. It is intended to facilitate interoperability between passenger coaches and locomotives without limiting the proprietary design ap-proaches used by individual suppliers. The intended use of the intratrain communications system is control of electronically controlled pneumatic (ECP) brakes, and the continuous monitoring and safety reporting of vari-ous components on passenger coaches and locomotives.