STO provided limited service to Chelsea and Cantley until June 2015 when Transcollines began operations in the Collines de l'Outaouais MRC.

STO is located on the Quebec-side of Canada's National Capital Region, and operates several bus routes through Downtown Ottawa, Ontario.

A year later, the CTCRO created an agreement with OC Transpo to make transfers between the two services easier.

[6] In 2012, it introduced its fleet of Novabus LFS articulated buses and the following year, it unveiled their new visual identity – L'avenir en commun (in English: the future together) as well as a new logo.

[7][8] In 2015, the STO bought 10 Classics from Calgary Transit, the last buses to be purchased second-hand from another company.

[10] Since 2002, Novabus LFS's have been purchased annually to replace older vehicles and to expand the fleet over time.

The STO planned to convert half of its total bus fleet into low-floor, LFS model NovaBus by 2012.

Another issue that was discovered with this model were the unreliable telescopic ramps that prevented wheelchair access to the bus.

A number of significant technology improvements and studies have been made over the past few decades by the STO.

During the summer of 2008, the STO has started a test trial of a prototype New Flyer articulated bus on several of its routes.