On April 28, 2007, three new stations in Laval opened making it the second line to leave Montreal Island.

On November 3, 1961, Montreal City Council approved an initial Metro network 16 kilometres (9.9 mi) in length.

[3][4] In November 1962, the city of Montreal learned that it had been awarded the 1967 International and Universal Exposition (commonly known as Expo 67).

On February 12, 1971, the council of the Montreal Urban Community authorized the borrowing of C$430 million to extend the Metro.

This expansion plan included the costs of extending the Orange Line westward, a distance of 20.5 kilometres (12.7 mi), adding 16 new stations, as well as the construction of a new garage.

To cut costs, three planned stations (Poirier, Bois-Franc, De Salaberry) and a maintenance workshop at the end of the track were eliminated.

In 1979, the Minister of Transport, Denis de Belleval, proposed to complete the subway extension to Du Collège and to extend the rest of the line above ground.

After a break of more than two decades of expansion, the eastern segment was extended from Henri-Bourassa by three stations into the city of Laval.

It was completely financed by the Government of Quebec, which mandated for the former Agence métropolitaine de transport (AMT) (now ARTM) to realize the project.

[14] In 2019, the STM announced plans to install platform edge doors on the Orange Line, to improve safety and reduce passenger incidents (dropped objects, falls etc).

The latter would create a transportation hub with the existing Bois-Franc station on the Réseau express métropolitain light metro.

[20] On 18 June 2019, the Autorité régionale de transport métropolitain approved a report for extending the Orange Line by 6.4 km to the north and east of the current Côte-Vertu terminus in St-Laurent to Montmorency station in Laval, which would create a loop.

Introduced in 1976, the MR-73 is the second generation of high-performance Metro cars, identified by rectangular cab headlights, blue and dark orange interiors, 124 kW (166 hp) traction motors that growl while they accelerate out of a station, side vents, and a unique three-note sound signature when the train pulls out of a station.

On June 20, 2018, a decorated MR-63 train gave a final "farewell tour" of the Orange Line before the model was retired from the entire system the following day.