士嘉堡輕鐵
From when the line opened in 1985 until 2015, it was known as the "Scarborough RT" or "SRT". The "RT" in Scarborough RT stood for "rapid transit". The name Scarborough Line is used on the official TTC website and 2014 TTC Ride Guide. In October 2013, the TTC announced plans to give the lines official numbers to help riders and visitors to navigate the system. The line is numbered 3, as it is the third rapid transit line to open in the system. New signage was installed in March 2014. In 2015, the name was simplified to "Line 3 Scarborough" and the TTC began shrink-wrapping the rolling stock with a blue vinyl finish displaying the number 3, a linear diagram of the Scarborough line, and the TTC logo. The original "RT" logo was no longer featured on the trains, except when the Line 3 shrink wrap is removed but not re-applied yet.