In November 2018, the TTC completed the extension the carhouse over tracks 3 and 4 on the east side of the building. Track 3 is the wash track and track 4 is utilized for interior cleaning and floor washing of the vehicles. Before the extension, tracks 3 and 4 were long enough for only four-car trains within the carhouse building, and the overhead doors on the north and south end had to remain open to service six-car TR trains. The open doors also exposed equipment to freezing in winter. With the extension, the TTC can use tracks 3 and 4 for the overnight storage of six-car TR trains.