There is currently no defined, independent standard defining event recorders for rail transit vehicles. Each order of new vehicles or overhaul of old rail transit vehicles requires engineering effort by all parties to determine which signals to capture, how often to sample and how long to preserve the information, requiring a learning curve in this area for every project. Users of this standard will include those who specify, purchase, design and build rail transit vehicles and their subsystems. They will all benefit from a simplified process of integrating diagnostic information from multiple subsystem suppliers.