On-time performance is a percentage measure of train performance. It is calculated by taking the total number of trains arriving "on-time" at the end-point of the run divided by the total number of trains operated on the run. A train is considered "on-time" if it arrives at the final destination, or end-point, within an allowed number of minutes, or tolerance, of its scheduled arrival time. Trains are allowed a certain tolerance at the end-point based on the number of miles traveled. For example, trains traveling 250 miles or less are allowed a 10 minute tolerance while trains traveling over 550 miles are allowed a 30 minute tolerance, which is the maximum allowed. A long-distance train traveling over 550 miles would be considered "on-time" if it arrived at its final destination within 30 minutes of its scheduled arrival time. On-time performance is only calculated and measured at the end-point of a train route.
Train delays are recorded in minutes and are a measure of deviation from schedule. Delays are classified by specific cause. Types of delay causes have been grouped together into the eight general categories: