[6] This line featured Saturday service from June 2000 until January 2002, when it was cancelled due to low ridership.

The Riverside Line can be used to get to Ontario International Airport; the East Ontario station has an airport shuttle served by Omnitrans Bus route 81 as of 2019, including discounted Lyft fares from the station.

Planning of the line's route has also come into question later in its lifetime, as the line was not redirected to the north half of the Monte Vista Subdivision to possibly construct a station to directly serve Ontario International Airport, which was heavily renovated in 1998.

As a result, many riders believe Metrolink has not made the line as much of a priority for frequent usage, which has shown in the decline of trains per day in recent schedule updates.

[5] Ridership by ethnicity was evenly split:[5] Numerous accidents and deaths have occurred on the Riverside Line since its inception.