The Via Rail Canadian transcontinental service from Vancouver to Toronto operates along the entire route of the Richmond Hill line, but does not stop at any stations other than Union.

During the COVID-19 pandemic, GO Transit reduced the number of coaches on all Richmond Hill line trains from six to four cars due to diminished ridership.

[9] As a part of the GO Transit Regional Express Rail (RER) initiative, train service along the Richmond Hill line is planned to be expanded over the next decade.

[11] To implement the planned RER service, the Richmond Hill line would need $1 billion in flood mitigation and a grade separation at the Doncaster junction with the York Subdivision.

In March 2023, Metrolinx found a different site for the planned facility in a light industrial zone at York Mills Road east of Leslie Street.