Blue Line (Delhi Metro)

Line 3 (Main Line): <a href="Noida_Electronic_City_metro_station" title="Noida Electronic City metro station">Noida Electronic City and Dwarka Sector 21
Line 4 (Branch): Vaishali and Yamuna Bank

Blue Line
(Line 3 & Line 4)
Blue Line; (Line 3 & Line 4)
	Fleet of Blue line manufactured by Mitsubishi-ROTEM
Overview
Status	Operational
Locale	Delhi, Noida, Ghaziabad
Termini	Line 3 (Main Line): Noida Electronic City and Dwarka Sector 21; Line 4 (Branch): Vaishali and Yamuna Bank;
Stations	Line 3 (Main Line): 50 ; Line 4 (Branch): 8
Service
Type	Rapid transit
System	Delhi Metro
Operator(s)	Delhi Metro Rail Corporation
History
Opened	Line 3 (Main Line): 31 December 2005,; Line 4 (Branch): 8 January 2010
Technical
Line length	Line 3 (Main Line): 56.11 km (34.87 mi),; Line 4 (Branch): 8.51 km (5.29 mi)
Character	At-grade, Underground, and Elevated
Track gauge	1,676 mm (5 ft 6 in) broad gauge
Electrification	25 kV 50 Hz AC overhead catenary
Route map
Route map
	Uttar Pradesh
	Delhi
	Anand
	Vihar
	Nizamuddin Bridge over
	National Highway 24

The Blue Line (Line 3 & Line 4) is a rapid transit metro line of the Delhi Metro in Delhi, India. Predominantly elevated, it consists of a Main Line (Line 3) with 50 stations from Noida Electronic City to Dwarka Sector 21, spanning a length of 56.11 kilometres (34.87 miles), and a Branch Line (Line 4) consisting of eight stations from Vaishali to Yamuna Bank, with a length of 8.51 kilometres (5.29 miles).

The Main Line (Line 3) held the title of the longest line in the Delhi Metro network until August 6, 2021, when the inauguration of the unfinished section between Shree Ram Mandir Mayur Vihar and Trilokpuri Sanjay Lake stations on the Pink Line extended it to a 59 km (36.66 mi)-long corridor, surpassing Line 3.