For Fixed-Route bus, roadcalls with lost service are defined as a measure of average number of miles traveled per service-interrupting roadcall incident. The higher miles between service interruptions indicates better performance and system integrity. Roadcalls with lost service are counted when a mechanical malfunction prevents the bus from continuing its scheduled service and must be removed resulting in abandonment of services provided. Other incidents that cause vehicle to be taken out of service such as vehicular accidents or tires punctured due to on-road debris are not counted. Similar to LIFT, roadcalls are broken down between “Major” and “Minor” mechanical failures.
For MAX, Mean Distance Between Failure (MDBF) is a measure of car miles between failures including in-service defect delays and mainline failures. In-service defect delays are delays at the pullout of 5 minutes or more due to mechanical incident. Mainline failures are failures due to mechanical incident that resulted from the train being taken out of service.
For WES, the relevant mechanical failure define as a mechanical or electrical failures on a commuter rail vehicle that causes service delay of more than four minutes at the destination platform for any trip.
For LIFT, a measure of the average number of miles traveled per roadcall incident. Roadcalls are classified as either “Major” or “Minor” mechanical failure. Major roadcalls pertain to any item that affects safety or mobility of the bus, such as problems with headlights, doors, brakes, engines, or transmissions. Minor roadcalls pertain to other systems of the bus such as air conditioning, radio system, and LIFT systems.
