Question: Is SunRail considered a light rail train?
Answer: No. SunRail is classified as commuter rail because it operates between a metropolitan downtown and suburbs that are more than 10 miles away. It shares tracks with freight trains and intercity trains, such as Amtrak. Typically commuter trains are pulled by a diesel locomotive, or draw electrical power from a third rail.
By comparison many light rail trains are similar to street cars. They are powered by overhead electrical wires. The actual train cars have a lighter frame and smaller body than commuter trains. Due to their size light-rail trains can operate next to crowded city streets with frequent stops. See the photo of the Dallas Area Rapid Transit Light Rail train.