49 CFR §273.11

1. (a)Connectivity. The connectivity metric is the percent of passengers connecting to and from other Amtrak routes, updated on an annual basis.
2. (b)Missed connections. The missed connections metric is the percent of passengers connecting to/from other Amtrak routes who missed connections due to a late arrival from another Amtrak train, reported by route and updated on an annual basis.
3. (c)Community access. The community access metric is the percent of Amtrak passenger-trips to and from not well-served communities, updated on an annual basis.
4. (d)Service availability. The service availability metric is the total number of daily Amtrak trains per 100,000 residents in a metropolitan statistical area (MSA) for each of the top 100 MSAs in the United States, shown in total and adjusted for time of day, updated on an annual basis.