Presently, rolling stock is maintained at Willowbrook Yard, located west of Mimico station in Toronto and at the new Whitby Rail Maintenance facility. A historical freight yard established by Grand Trunk Railway in 1910, GO Transit acquired Willowbrook Yard from Canadian National sometime after its inception, and has expanded the facilities onsite to maintain the expanding fleet. GO Transit has built a second maintenance yard covering in Whitby to accommodate additional trains for its upcoming Regional Express Rail project, and was completed by the end of 2017.