- Owner
- Toronto Transit Commission (Lines 1, 2 and 4) Metrolinx (Lines 5 and 6)
- Area served
- Greater Toronto
- Locale
- Toronto , Ontario Vaughan , Ontario
- Transit type
- Rapid transit
- Number of lines
- 5 (plus 1 under construction)
- Number of stations
- 109 (plus 26 under construction)
- Daily ridership
- 1,089,300 (weekdays, Q1 2026)
- Annual ridership
- 331,789,000 (2025)
- Began operation
- March 30, 1954 ; 72 years ago ( 1954-03-30 )
- Operator s
- Toronto Transit Commission
- Number of vehicles
- 830 heavy rail cars 66 work cars
- Train length
- 6 cars (Lines 1 and 2) 4 cars (Line 4) 2 cars (Line 5) 1 car (Line 6)
- Headway
- 2 min 30 s – 5 min (Line 1) 2 min 20 s – 6 min (Line 2) 5 min 30 s (Line 4) 4 min 4 s – 12 min 40 s (Line 5) 6 min 32 s – 12 min 15 s (Line 6)
- System length
- 100.1 km (62.2 mi) , (33.2 km (20.6 mi) under construction)
- Track gauge
- 1,495 mm ( 4 ft 10 + 7 ⁄ 8 in ) Toronto gauge (Lines 1, 2 and 4) 1,435 mm ( 4 ft 8 + 1 ⁄ 2 in ) standard gauge (Lines 5 and 6)
- Electrification
- Third rail , 600 V DC (Lines 1, 2 and 4) Overhead line , 750 V DC (Lines 5 and 6)