Category: Rail Operations_Administration

FAILURE RATE

Rate at which failures occur as a function of time. If the failure rate is constant, it is frequently expressed as the reciprocal of mean-time-between-failures (MTBF). (NTSC)

HAZARD

Any real or potential condition that can cause injury or death, and or damage to or loss of equipment or property.

HAZARD LEVEL

A qualitative measure of the worst potential consequences that could be caused by a specific hazard. Category I: Catastrophic; may cause death or system loss. Category II: Critical; may cause severe injury, server occupational illness, or major system damage. Category…

SINGLE POINT FAILURE

A failure of a subunit which by itself will cause a failure of the system or equipment.

SPEED LIMIT

1. The maximum speed allowed in a specified section of track as determined by physical limitations of track structure, train design, and passenger comfort. 2. A prescribed maximum road speed allowed. (NTSC)