The Yonge-University-Spadina Line (Line 1) opened in 1954 with a 7.4km service between Union and Eglinton, costing $50.5 million at the time. A subsequent extension to St. George in a U shape opened in 1963. Future extensions moved up to Finch in 1974, where it remains the terminus today.
Union Station handles some 125,000 passengers a day. To alleviate overcrowding in the small station with a narrow platform, a 2nd platform was added, taking about 4 years to complete. The revitalized station opened in 2015.
The Bloor-Danforth Line (Line 2) opened in 1966 between Keele and Woodbine.
The Yonge-Bloor interchange is extremely congested. After the Line 1 platform was expanded long ago, the TTC wants to build a 2nd south platform at the Line 2 station so passengers can better disperse. This expansion project is expected to cost $1.5 billion and finish in 2029.
The 420 new accessible Toronto Rockets are being phased in to replace aging rolling stock from the 1970s. Unlike the older vehicles, all the cars are connected to better spread the passengers throughout the train.