This is a list of the operating passenger rail transit systems in the United States. This list does not include intercity rail services such as the Alaska Railroad, Brightline, or Amtrak and its state-sponsored subsidiaries. "Region" refers to the metropolitan area based around the city listed, where applicable.
| Region | State | System | Authority | Type (FTA) | Opening | Notes |
|---|---|---|---|---|---|---|
| Orange County | California | OC Streetcar | Orange County Transportation Authority | Streetcar | 2026 | |
| Prince George's County and Montgomery County | Maryland | Purple Line | Maryland Transit Administration | Light rail | 2027 | |
| Omaha | Nebraska | Omaha Streetcar | City of Omaha, Nebraska | Streetcar | 2028 |